i30 Owners Club

GOT PROBLEMS OR ISSUES? => DIESEL => Topic started by: Lofty UK on December 31, 2008, 19:07:48

Title: Poor Fuel Consumption
Post by: Lofty UK on December 31, 2008, 19:07:48
My i30 1.6 CRDi was purchased new in October 08 and it is a great little car except that I am only getting 45mpg - yet combined published figure is 60.1mpg. I've not done the Ozzie conversion to litres yet but it sounds as though some of you are having the same problem, yet others are doing 70mpg+! I am an economical driver and got 48mpg out of my previous Renault Laguna (v. published 51mpg) which is very fair (but had done 27k miles when I got it).
Apart from tyre pressures, can anyone say if there is any hope I will ever get near to the 60mpg claimed? My dealer says to bring it in when it has done 4k miles if no better. It has now done 2700 miles. There don't seem to be too many owners forums in the UK yet.
Title: Poor Fuel Consumption
Post by: Shambles on December 31, 2008, 19:14:08
Hiya Lofty - welcome to the i30owners club

Before I fitted a tuningbox I was getting just over 59mpg. Now I get 62+mpg.

Your figure of around 45mpg doesn't sound quite right; your economy should be better than that. How are you measuring it? If you've only done 2700 miles have you tried resetting the consumption meter and starting afresh from the next fillup?
Title: Poor Fuel Consumption
Post by: Lofty UK on December 31, 2008, 20:24:58
My last post does not seem to have worked so apologies if I repeat myself!
I have tried the trip - usually every 4 weeks in line with expense claims for work. Receipts calculated since purchase verify the low mpg. I hope it wil improve with more mileage. its the only disappointment, othewise it is a great little car. 
Title: Re: Poor Fuel Consumption
Post by: Shambles on December 31, 2008, 20:36:13
Hey Lofty. As you're reporting a specific problem I split the posts from the generic fuel discussion thread.

Good that you like the i30 and also good that your dealer is willing to have a look at it.
Title: Re: Poor Fuel Consumption
Post by: Dazzler on December 31, 2008, 20:55:19
welcome to the club lofty..hopefully your economy will improve soon...are you shifting up at around  2000 -2400 rpm and not at say 3000?
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on December 31, 2008, 21:02:54
Yes Darryl, thanks, never rev it hard. I never had to even watch the revs in my Laguna - but it had done 27-50k during my ownership so maybe there is hope yet??!
Title: Re: Poor Fuel Consumption
Post by: eye30 on December 31, 2008, 22:33:23
Welcome Lofty UK

Where do you live?

I only do 14 miles a day, round trip, and at the moment I'm showing 47 to 51mpg. Varies depending on how cold it is.

In the summer/warm weather this was 55'ish mpg.

The cold does seem to effect the return.

I know shambles travels some 80 plus per day so he is getting a great turn but his car is running at temperature plus he has his tuning box.

If you are doing small mileage the the return seems about right for the 1.6crdi given the cold weather we are getting.

Also, if you are heavy right footed this will have an effect.  

The secret with the diesel is to be very light footed and let the car drive it self.

Stick with it, It will get better
Title: Re: Poor Fuel Consumption
Post by: Thumper on January 01, 2009, 00:33:20
Welcome to the forum!  :cool:

I have done close to 30,000km and now just noticing the engine is 'starting' the free up slightly.

Also with the cold in your part of the world, expect the economy to be worse. (When it warms up, the economy will be better)

Don't give up, the first few tanks will not be the best for economy.  :cool:
Title: Re: Poor Fuel Consumption
Post by: Rubix on January 02, 2009, 04:06:50
I used to get an economy range of 150km from a 35L tank in my old Diahatsu, depending on where I drove it. Eg, 320km from 35L when I did just 5-15min drives for 3 weeks (= 10.9L/100km); and one week I got 450km from the tank when I took it up the coast for the weekend (= 7.7L/100km). Thats after the things done 225,000km - so this is a well-run-in engine. Thumper's economy is so much better than listed because he's driving it so far. If you don't drive it that far, you'll get worse economy than Hyundai advertise, and you have to expect that. The 'listed' figure is based on a well-rounded driving schedule of short and long distances. It's also based on a car that's been run in a bit, and you're looking at a few 1000km before all your working parts are functioning optimally (from what I've read, including posts on this forum). Give it some time.

Title: Re: Poor Fuel Consumption
Post by: sparki30 on January 02, 2009, 14:40:17
Hi Lofty UK, just out of interest what is your averagre speed (on the computer) for your MPG reading? My wife uses it for short runs and get 40mpg at an average speed of 14mph. We have done slightly longer distances over the xmas break and getting 45mpg at 23mph. our 1.6 CRDI has only 5500 miles on it.
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on January 02, 2009, 21:35:16
In reply to the latest posts - will check the average speed thanks, but I do varied journeys at work including 70mph dual carriageways/motorways roads - and very lightfooted/low revs to nurse the mpg. The Govt body that awards statistics told me they test cars at 1,800 miles. Well, I've now done 2700 and its not improving yet but from the sound of other owners, it may do in the future, especially in Summer. Thanks for your help.
Title: Re: Poor Fuel Consumption
Post by: warshell98 on March 23, 2009, 05:31:32
I too was having issues with poor fuel consumption until recently. Our car has just done 7000Km and up until that point we were unable to get better than 6.7L/100 around town and thats driving like regular people not those obsessed with consumption, some times the car see's 4000+ rpm but changing at around 2500 - 3500 if we want to get a move on and around 2000 - 3000rpm normally. Things recently changed at around 6800Km, the litres per hundred suddenly dropped to 5.3 / 5.4 driving no differently around town and all short trips. Went to the airport the other day, about 240Km round trip, and picked up 5L/100, ( no a/c ) its never been there before :mrgreen: I'm told it should improve a little further so if I can manage 5 around town and 4.7 on a good run I'll bee fairly happy
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on August 30, 2009, 21:35:23
Mpg still no better even after 10 months of ownership and 14k miles.
Hyundai quote 60mpg combined driving and the best I can get is still 48mpg and I drive very economically to try to achieve the quoted figures. (Trip figs verified by calculating diesel purchased and miles covered)
Service garage on 12k service say they can find nothing wrong with it.
I tried Advertising Standards but they say someone has already complained about this issue. Hyundai just have their standard phrase about true life conditions - a real cop out and I really think we are being ripped off as 12 mpg short is a long way short - does anyone have any advice please?
Title: Re: Poor Fuel Consumption
Post by: Shambles on August 30, 2009, 22:00:28
Hey Lofty...

You really are having a whine tonight aren't you :rolleyes:

My only, and the simplest, suggestion would be to disconnect the -ve battery terminal for half an hour and let the ECU cool off. I'm lead to believe that upon reconnection that little device will re-learn your driving style.

It's free - try it
Title: Re: Poor Fuel Consumption
Post by: Lorian on August 31, 2009, 09:39:04
The other common tip seems to be to make sure you change up gear at 2,000RPM.

Our other car is a 1.6 Diesel peugeot 207. On the same 50 mile route she can always average 5-6mpg better than me with her normal driving style, even compared to me trying really hard to keep off the gas and use tows. It's very annoying!
Title: Re: Poor Fuel Consumption
Post by: eye30 on August 31, 2009, 10:59:41
Are you taking the MPG's from the dash readout?

This is a time period average not a single trip average so take what that shows with caution.  Best to fill up to brim and then refill to brim to work out average.

Your MPG's will go up or down by a few MPG's depending on how you drive - hard or gentle acceleration/braking and also the type of traffic you are driving in.

Depending on time of year I'm averaging out between 48 (cold weather reduces MPG's) to 54 (warm weather). 

I drive in a mixture of heavy/light/urban roads and motorway and currently my read out is showing 54.3 MPG.
Title: Re: Poor Fuel Consumption
Post by: Mri30 on September 19, 2009, 05:46:57
Hi All
My fuel consumption in my vivid blue auto CRDi 1.6, at 7500 K's is:  Av. K's L 16.65: Av L/100 K's 6.04: and finally all that equals 46.98 mpg. I am extremely happy with that.  :D  :)

Cheers

Dave
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on November 24, 2009, 14:27:41
Dear eye30.
You are very lucky.
I have now done 15,000 miles and I drive very economically.
The best I have achieved is 50mpg on a long run (and re-setting the trip for the motorway only!)
I have also calculated all the fuel used v the miles covered.
I have had it checked at the garage, serviced, tyre pressures checked etc. etc.

Mine is an 'i-thirsty' and I am still very unhappy about it.
I now get 43mpg v. the 60mpg quoted in the brochures - 25% less than it should.
I consider this to be totally unacceptable.
Title: Re: Poor Fuel Consumption
Post by: sparki30 on November 24, 2009, 15:05:27
For town driving I find 3rd gear best up to 40mph , just does not like it in 4th, (due to gear ratios) ours has done 15500miles now and get 41-43 mpg at 14-16mph average speed. So I would say Lofty, yours is on the thirsty side. Oh, I just use supermarket fuel.
Title: Re: Poor Fuel Consumption
Post by: eye30 on November 24, 2009, 18:42:17
Well that's what the read out says. 
I'm not convinced that this is accurate as when I logged fuel to mileage on a recent long trip I calculated some 10 MPG over the readout.  (69mpg readout = 61mpg, I think)

Pity it doesn't give trip readout as well, then I/you can get a better feel for MPG depending on type of driving - urban, motorway, stop/start etc.

I drive conservatively by stroking the accelerator in the diesel but will put right foot down on clear road/motorways.  May be this is why I'm getting such a high readout.

When I've drive the petrol i30 I found I had to press the accelerator to get any feel not so in the diesel. 

Diesel just seems to go on its own.
Title: Re: Poor Fuel Consumption
Post by: middy on November 24, 2009, 23:49:53
Pity it doesn't give trip readout as well, then I/you can get a better feel for MPG depending on type of driving - urban, motorway, stop/start etc.

If you reset the reading at the start of the trip then it will be a trip readout.   :wink:

I might start to do this actually, just to see what difference varying driving styles make to the consumption.

Interestingly I have just gone from by best reading on the previous tank (5.6 l/100km, 51 mpg) to my worst on this tank (6.3 l/100km, 45 mpg)   :eek:

I have been using the A/C a lot on this tank though due to all the hot weather we are having at the moment.
Title: Re: Poor Fuel Consumption
Post by: Pip on November 25, 2009, 07:51:30
Dear eye30.
You are very lucky.
I have no done 15,000 miles and I drive very economically.
The best I have achieved is 50mpg on a long run (and re-setting the trip for the motorway only!)
I have also calculated all the fuel used v the miles covered.
I have had it checked at the garage, serviced, tyre pressures checked etc. etc.

Mine is an 'i-thirsty' and I am still very unhappy about it.
I now get 43mpg v. the 60mpg quoted in the brochures - 25% less than it should.
I consider this to be totally unacceptable.
Lofty,
The car itself is but one of the variables, and I suspect less variable than the others, such as the driving conditions and the driver.

Our cars sound similar and I bet if we exchanged them we would both still get the same economy as we do now.

You say you drive economically but with respect, maybe you can do better: What sort of techniques do you use? You also checked tyre pressures but what are they? The thing you have least control over is the prevailing conditions, the fastest yacht will be slow when the wind doesn't blow and the most economical car will use more juice when in slow traffic because you can't get into a high gear for long periods.

My mix of trips is about 50/50 highway/suburban and I have seen a low of 4.4l/100k (~65mpg) after a trip and a high of 5.5l/100k (~52mpg) around town. My average for each tank usually ends up somewhere in between at 5.0l/100k which is about 57mpg.

My tyres are moderately firm at 38/34 psi F/R and my driving style is more grandpa than hoon.  A/C rarely off. 

I know what I'm getting is closer to what you wanted and doesn't help you to know that some other prick is happy :-[ but seriously, you may not be able to achieve your desire unless you can change the prevailing driving conditions and/or the way you drive. Of course I don't know how you drive and am not suggesting you are driving poorly (WRT economy) but really eeking out the juice does require better than average knowledge and applied ability, just the same as driving fast on the track does - although economical driving is potentially safer then the latter.  :D

My wife uses more fuel than I do and sitting as a passenger reveals why. She has a heavier foot both on the gas and the brake and holds the lower gears longer than needed. Her scope of involvement is much smaller than mine and doesn't anticipate slowing traffic much beyond the car in front for instance. Think I tell her any of this? I hope I come across as slightly smarter than this :cool: but in any case, her needs and wants from the car align perfectly with her driving style and personality. She really doesn't have a problem, just an alternative approach.

In your case, if your wants are not met, keep seeking the reasons and hopefully they will end up being something other than a poor example of our wonderful i30. In which case you can potentially control it. However, if you really do have a bad car you can expect little interest from Hy. It is really hard to get objective results for economy and you likely will not be able to prove your case unless it is really obvious. 
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on November 25, 2009, 13:51:54
Thanks for your thoughts - driving is not my problem - I got 50mpg no problem with my Laguna 1.9dci (within 1mpg of quoted combined figs)
Also I won a driving competition for smooth driving with Jackie Stewart!
Tyre Pressures I put 33 in although it says 32 in case some escaped whilst retracting the nozzle.
Bit of good news though - today I spoke with the MD of my dealership, he has spoken with tech dept at Hyundai and they are going to send someone down to test it with a laptop plugged in for 40 miles.
Title: Re: Poor Fuel Consumption
Post by: Pip on November 25, 2009, 14:46:23
It will be interesting to hear what they come up with.
Title: Re: Poor Fuel Consumption
Post by: eye30 on November 25, 2009, 21:02:47
Think I tell her any of this?


I take it you like your way of life so why up set the apple cart  :lol:
Title: Re: Poor Fuel Consumption
Post by: andys101 on January 17, 2010, 20:23:11
Any update,

Andy.
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on January 18, 2010, 09:12:19
I am awaiting another appt with Hyundai as the one scheduled had to be postponed due to the severe weather/snow.
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on March 19, 2010, 18:03:16
Well, on 18th February the technicians from Hyundai's Head Office came to look at my car. (I was not there as I had to leave it at the dealer's - Richmond Hyundai, Portsmouth - until they arrived).
I was advised by the Service Manager that they had taken it out and achieved 61mpg - how I don't know but can only guess they only did one trip without stop/starts/on motorway/at steady low speed. The trip read 55 when I picked it up a couple of days later after a scratch was repaired.

With normal (yes normal calm) driving the trip has now decreased to 45.8 mpg

I was advised that a full report from Hyundai would follow.
However, over a month later and in spite of chasing this up with Richmond Hyundai who have also chased Head Office, it has still not materialised!

I feel very disillusioned needless to say and have chased this up with Head Office myself just now and hope to hear soon. :'(

By the way, it has now covered almost 17k miles.
Title: Re: Poor Fuel Consumption
Post by: eye30 on March 19, 2010, 18:10:26
needless to say and have chased this up with Head Office myself just now and hope to hear soon.

Now. When HY HQ reply it will be interesting to see their comments and that the tec was from HQ.

Did they say how they tested?
I'm just wondering if the 61 MPG they state was what the on board computer said because I've actually had 199 mpg when I've reset, albeit for a mega second,
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on March 19, 2010, 18:16:13
Yes, they filled up to brim and calculated the miles travelled (some 100 miles I believe)
Title: Re: Poor Fuel Consumption
Post by: eye30 on March 19, 2010, 19:19:38
Just to help you.

I only travel 7 miles to work and 5 home.

My consumption is between 48 mpg during the cold days to 56 mpg during the warmer days.

So say average of 51 mpg.

Just before you ask.  The journey to work I use Motorway which goes in an arc whereas going home I use the A roads which travels in a straight line.  The reason I use the motorway is for convenience in the morning because my trip takes me past several schools and you get caught up in the the school run 4x4's, say no more.
Title: Re: Poor Fuel Consumption
Post by: Dazzler on March 19, 2010, 20:38:06
Just before you ask.  The journey to work I use Motorway which goes in an arc whereas going home I use the A roads which travels in a straight line.  The reason I use the motorway is for convenience in the morning because my trip takes me past several schools and you get caught up in the the school run 4x4's, say no more.

So you couldn't really refer to that as a round trip to work and home (more of a half round trip... :lol:)
Title: Re: Poor Fuel Consumption
Post by: eye30 on March 20, 2010, 12:47:50
Just before you ask.  The journey to work I use Motorway which goes in an arc whereas going home I use the A roads which travels in a straight line.  The reason I use the motorway is for convenience in the morning because my trip takes me past several schools and you get caught up in the the school run 4x4's, say no more.

So you couldn't really refer to that as a round trip to work and home (more of a half round trip... :lol:)

Nice one Daz

PS some days I go the other way around the arc so can we now say a full round trip and a poke thro' the middle :lol:
Title: Re: Poor Fuel Consumption
Post by: Xamaxy on March 28, 2010, 19:08:22
First and easiest thing you can try is to remove your rock solid opinion about being economical driver. Please take no offense. In that way you can be open for few perhaps new suggestions about economical driving that you didnt know.
I'm sure you realize that stated figures by Hyundai and any other motor company are made in apsurd conditions! ->for example: for my i30 which is 2.0l 140hp is stated only 4.4l on highway, i got 4,5l by driving 53mph in 6th, totally insane and bad for engine.
When driving 70mph as you said it raises straight to 5,5l, 90mph=6.6l etc etc

There is like thousand things that influence combined driving, for example braking, use brake often and you will 100000% get worse economy, shift it even at 2500 revs you'll get worse economy, constant stop and go=bad economy, like said before me low average speed mean worse economy (too many stops and traffic jamms) and not even 60miles of highway wont save you because thats only like 0.5 or 1l saved in total-one can sneeze that much:D.

Kia Ceed has the same engine, and a buddy of mine is getting 7,4l in city driving and he's going nuts! From factory figures 7,4 is like science fiction to achieve, but, he made it. Not the cars fault, its him, and also he is like 1000000 times better driver then me he says, and i'm getting with 2.0 only 6,2l in city.

One again pls dont think i'm trying to troll or insult you, just pointing out that like in everything overconfidence is bad thing  :rolleyes:
Title: Re: Poor Fuel Consumption
Post by: Lorian on March 28, 2010, 20:20:21
Last time I visitied the Richmond and wimbledon areas the traffic levels were pretty high and it was difficult to maintain a decent average speed. Lots of stopping for traffic. That's zero mpg for lots of the time, it's bound to drag the average down for sure.  I guess this is where ISG comes in.
Title: Re: Poor Fuel Consumption
Post by: aussie pete on March 31, 2010, 03:45:25
Hi Lofty,

I've had a similar experience with my similar vintage i30. Similar response from Hyundai (Aus) too about drivinging and testing too.

The good news it mine has just begun acheiving the claimed economy with 35,000km (approx 22,000 milesish). Perhaps if you put on a few more thousand miles yours will do the same. Maybe that batch of engines were particularly tight.

Things I have noticed that contribute to the average consumption -  Short trips when car is cold will massacre any sort of economy - It takes about 5 miles for the car to warm up.

Use of the A/C will also bump the consumption up by about 15% - but that is so worth it on the 30 degree+ hot days that we get in Sydney.

Title: Re: Poor Fuel Consumption
Post by: Dazzler on March 31, 2010, 12:15:43
Using the a/c when driving on the highway or for that matter around town hardly effects my economy.. It might be a different story if the outside temp is over 30c and traffic is stop start or the area has steep hills...
Title: Re: Poor Fuel Consumption
Post by: poorpigi on April 26, 2010, 04:35:20
I  have an auto and just filled up my fourth tank with 2100 ks on the clock and I get a reading of 7.4l per 100Ks.  I got 750k 1st tank, 700 the 2nd and 650 the 3rd and now it readout says that I will get 600 for the 4th.  Air is on all the time and most of the driving have been highway at 100 with about a 1/4 city driving.  I don't pussyfoot but am not an agressive driver either.

Was hopeing it would be better than this by and can't understand why I keep geting less mileage but the readout keeps saying 7.4lp100





Title: Re: Poor Fuel Consumption
Post by: Dazzler on April 26, 2010, 10:30:26
and can't understand why I keep geting less mileage but the readout keeps saying 7.4lp100

The more kilometres you do without resetting the readout the more it takes to change the figure...

Try and fill it to the brim and then Hold the trip button until the mileage re-sets also do the same with the trip meter. See how far you go until the the distance to empty goes to -- (roughly 50 km left)

Be interesting what the lp100 will read after a few hundred kilometres after being reset...

Cheers,

Dazz
Title: Re: Poor Fuel Consumption
Post by: lindlake on April 26, 2010, 11:56:33
I  have an auto and just filled up my fourth tank with 2100 ks on the clock and I get a reading of 7.4l per 100Ks.  I got 750k 1st tank, 700 the 2nd and 650 the 3rd and now it readout says that I will get 600 for the 4th.  Air is on all the time and most of the driving have been highway at 100 with about a 1/4 city driving.  I don't pussyfoot but am not an agressive driver either.

Was hopeing it would be better than this by and can't understand why I keep geting less mileage but the readout keeps saying 7.4lp100

it took my auto diesel 10000 km before i got 1000km to the tank i do not go slow i have 30000 km now and still get the same 6.2 l per 100 km




Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 05, 2010, 17:47:56
I always achieved the quoted mpg from previous cars - Renault Laguna 1.9dci; Vauxhall Astra diesel company car etc.
Therefore it is not me it is the i30 that is at fault.
Head office tech came down to test run it but said it is within their acceptable range. 25% below data figs I consider totally unacceptable.
 :rolleyes: :mad:
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 05, 2010, 17:52:37
Thanks Pete
Dream on then! First garage tell you wait til 6k miles, now you say it is 22k - well I've done 17.5k so not long to go.
Hy HQ did send tech down and he took it out for 120 miles.
Verdict? 'within the acceptable range!
25% below quoted data I believe is totally unacceptable and I have told them so.
Watch this space.
Title: Re: Poor Fuel Consumption
Post by: Dazzler on May 05, 2010, 23:28:11
Not good m8 .. have you tried swapping to a different brand of fuel and/or oil as well ...

So recent feedback over here suggests that can make quite a difference in some cases..
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 08, 2010, 15:08:15
My Service Manager told me that the spec of i30 in Oz is different to UK - wonder why - weather?
I buy various brands of diesel, nothing seems to make any difference.
Also tried V-power and no significant improvement and it costs a lot more so defeats the object anyway.
Annual service due in July so will mention your suggestion re oil but no doubt they will have their own ideas.

Thinking back to my petrol Vauxhall Vectra too, i got 38mpg in that which was good for a big car and currently on 44mpg diesel from medium hatch i30 which is appalling.
Title: Re: Poor Fuel Consumption
Post by: Lorian on May 08, 2010, 18:50:49
My economy has very nearly doubled since moving from a 2.0Sri Vectra 130

On a 200 mile run earlier the week the car averaged 72Mpg. This was a non-stop motorway and A road journey at an average of about 60mph. Tesco diesel, no additives.

This was without conciously taking tows or trying to hypermile.
Title: Re: Poor Fuel Consumption
Post by: Dazzler on May 08, 2010, 22:48:46
Just a thought Lofty ..

If only you could catch up with one of our other UK members with similar specs and have a day out together covering say 100miles together nose to tail (after zeroing your trip computer)

Anyone up for it .. the way I see it that would be the best way to get a true comparison with another i30...

I would be happy to do it if you were over here (a picnic lunch or a BBQ etc.. :idea:)
Title: Re: Poor Fuel Consumption
Post by: i30sean on May 08, 2010, 23:49:22
I'm still very pleased with my i30 getting 50mpg over a tank full that includes short trips around town and few longer trips on motorway, infact my wife's started wanting to use my i30 as it's even better then her 1.6 Astra  :eek:

i30Sean

PS I still have to fill it up though!
Title: Re: Poor Fuel Consumption
Post by: Weston Coyney on May 09, 2010, 11:40:08
Hi Lofty. Just logging-in to give you some moral support (must be tedious with everyone knocking your driving style!) and to say that you are not the only one a bit disappointed with the fuel consumption.
 My 1.6 CRDi refuses to give more than 46mpg (checked brim-to-brim; computer suggests 43) at 9000 miles. Okay, so it's an Auto rather than the six-speed, but I don't do city work nowadays, just main roads and motorways at sensible speeds. Under these conditions the transmission is in mechanical lock-up 95% of the time so it really should not be sapping much extra fuel. Probably 46mpg would seem good to many people but I've owned French diesels for over 20 years and always found them capable of delivering very high figures.
Here are a few thoughts to consider.
1. All the diesels in my own experience have continued to improve in terms of performance/economy over quite considerable mileages.
2. Autocar magazine had a Kia Ceed 1.6 CRDi (same engine as ours) on long-term test a while back. It was 3-door, 6-speed manual, but could only manage 43.5mpg, a long way off the 'official' figure (but obviously quite a new car).
3. The i30 engine does seem remarkably eager and responsive and this leads me to suspect that the fuel mapping is possibly not set up with ultimate economy in mind. This might not be a big problem in other markets but, of course, here in the UK we still have the world's most expensive fuel!
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 09, 2010, 14:16:47
Many thanks, yes I know I am not alone in getting below average mpg and it is definitely not my driving.
By the way, mine is a 1.6crdi so it only has 5 gears, not sure how the 2.0crdi with 6 gears compares but seems the range of good to bad is wide!
I've now done 17,500 miles but so far its not got any better.
Title: Re: Poor Fuel Consumption
Post by: i30sean on May 09, 2010, 18:03:16
Hi Lofty, mines a 1.6crdi as well but a 6 speed i think that extra gear does make a big difference on longer runs. This is my first ever diesel and I have adjusted my driving style to a petrol car, I change gear much earlier and have found that mpg improves over time, funnily when my wife drives the car she drives it like her petrol Astra reving it a bit more and I notice immediatly the mpg drops but of course can't tell her that LOL.

i30Sean
Title: Re: Poor Fuel Consumption
Post by: rushandy on May 11, 2010, 19:30:20
Some unscientific feedback from me lofty...

At the moment I'm getting about 47mpg combined in a 1.6CRDI 6 speed (2010 model). I currently have about 1500 miles on clock.

I'm not the lightest footed driver, but I don't drive too aggressivley either. Just a normal driver really. I probably do about 50 / 50 motorway / town driving.

I think if I focused on driving as economically as possible I could probably keep it above the 50 mpg mark, but it would be a struggle and would take me a while to get anywhere if on the motorway, as I find between 50 - 60mph in 6th gives best economy, whereas I like to cruise between 70 - 80 conditions permitting.

I too am hoping figures will improve given time, but I'm still saving tons of money as my last car was a 14yr old BMW 520 which gave me about 25mpg... so although the figures aren't (yet) close to manufacturers claimed, I still feel better off.

Title: Re: Poor Fuel Consumption
Post by: Shambles on May 11, 2010, 19:32:24
^-- you wait until your clock rolls over 15,000 miles. That's when Fergie started to breathe properly and changed from good to great :)
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 17, 2010, 13:16:18
Hiya, thanks, but mine has already done 17,500 miles :exclaim:
When I bought mine, only the 2.0crdi had six gears. The 1.6 only 5 gears.
VW Golf does have 6 and the 1.9 diesel does over 60 - closer to 70+ mpg if my friend's one is anything to go by.

Doesn't have the extras that the i30 Premium has though.

I am driving like a Granny and coasting around and keeping revs down to see if I can get it to creep up but max is still 48 mpg combined even including some longer journeys
Title: Re: Poor Fuel Consumption
Post by: Shambles on May 19, 2010, 19:12:55
Many thanks, yes I know I am not alone in getting below average mpg and it is definitely not my driving.

I can't remember if it's been mentioned previously in this thread, but have you considered "resetting" the ECU. By disconnecting the -ve lead from the battery and waiting 30 mins or so before reconnecting, it's been said that the ECU will re-learn your driving style, adjusting and fixing parameters according to your demands.

Done it myself a few times; have to retune the radio and reset a few audio options, plus the ESP OFF light will stay illuminated when the car is first started, but surely worth a try?
Title: Re: Poor Fuel Consumption
Post by: Lofty UK on May 19, 2010, 19:17:07
Thanks for the suggestion but I'm not up to playing about with it and will leave any adjustments to the dealership on next service. Will see what they say - is this likely to improve the mpg then?  :rolleyes:
Title: Re: Poor Fuel Consumption
Post by: Shambles on May 19, 2010, 19:27:26
It only takes 2 minutes to do, plus half an hour waiting, so no real biggy.

I ran with a tuningbox fitted for quite some time but decided to remove it once my throttle pickup in 1st & 2nd had improved over time (I fitted the tuningbox to provide greater low-end boost). Following removal I didn't reset the ECU (as above) and my consumption dropped considerably from around the 62mpg. I ran for a couple of months enduring 52mpg (best) until I remembered the ECU "trick". I'm now back around the 60mpg mark and still improving.

I know you've had yours a while now (Oct 2008?) but can you remember how many miles were on the clock when you picked it up, and do you remember driving like a pussy for the first thousand miles or so? It's a fair possibility that your current ECU pattern is not best geared to providing you with the economy you're looking for. All I'm saying is... resetting it is as simple as disconnecting the battery -ve lead for a bit, allowing the charge within the module to deplete, giving you another go at making it relearn your best moves, so to speak :)
Title: Re: Poor Fuel Consumption
Post by: tebstersi30 on June 27, 2010, 17:11:14
My i30 1.6 crdi 6 speed is relatively new and only just covered 1500 miles, I have only used it on long trips so far to our caravan in wales and at best have achieved 47mpg, worst been 43mpg, this was doing 70 mph on motorway and 60 araound the country lanes, and literally tickling the accelerator, this was calculated via brimming the tank method.
I too do find it a bit disappointing as my focus 1.6 tdci would achieve on the same trip an average of 54.6 mpg !
I am hoping that this is down to a tight engine and hope that it will improve with more miles on it, so lofty uk your not on your own !
Title: Re: Poor Fuel Consumption
Post by: Dazzler on June 27, 2010, 22:43:04
My i30 1.6 crdi 6 speed is relatively new and only just covered 1500 miles, I have only used it on long trips so far to our caravan in wales and at best have achieved 47mpg, worst been 43mpg, this was doing 70 mph on motorway and 60 araound the country lanes, and literally tickling the accelerator, this was calculated via brimming the tank method.
I too do find it a bit disappointing as my focus 1.6 tdci would achieve on the same trip an average of 54.6 mpg !
I am hoping that this is down to a tight engine and hope that it will improve with more miles on it, so lofty uk your not on your own !

It is strange but a handful of our members are finding a significant improvement over time while most are getting pretty good economy from the start...I am reasonably happy with my economy having averaged around 5.4 LPH since new which is only around 44 MPG I think..but Tasmania is very hilly and I just drive normally with lots of 7 -10 kilometre trips during the week...

Have barely (if ever) seen the 4.7 LPH ADR figure used in advertising...even on long trips  :'(
Title: Re: Poor Fuel Consumption
Post by: Mutley on June 28, 2010, 00:58:37
Try and fill it to the brim and then Hold the trip button until the mileage re-sets also do the same with the trip meter. See how far you go until the the distance to empty goes to -- (roughly 50 km left)

You can get 100km after it goes to --- :wink:
Don't go any more though or you'll run out! lol
Title: Re: Poor Fuel Consumption
Post by: agentr31 on June 28, 2010, 09:05:16
*shudders at the thought of running out of diesel*
Title: Re: Poor Fuel Consumption
Post by: Dazzler on June 28, 2010, 10:11:31
Try and fill it to the brim and then Hold the trip button until the mileage re-sets also do the same with the trip meter. See how far you go until the the distance to empty goes to -- (roughly 50 km left)

You can get 100km after it goes to --- :wink:
Don't go any more though or you'll run out! lol

Really? I did about 40kms the other day then chickened out... :-[
Title: Re: Poor Fuel Consumption
Post by: Mutley on June 28, 2010, 10:36:29
*shudders at the thought of running out of diesel*
haha it's not that bad, when you do just put about 10L of diesel in, then take the fuel line off the pump and prime it manually until fuel flows out, then reconnect and you're away!

Try and fill it to the brim and then Hold the trip button until the mileage re-sets also do the same with the trip meter. See how far you go until the the distance to empty goes to -- (roughly 50 km left)

You can get 100km after it goes to --- :wink:
Don't go any more though or you'll run out! lol

Really? I did about 40kms the other day then chickened out... :-[

Yup! You won't get more than that though, trust me on that one :wink:
I wouldn't try to do more than 80 after it goes to --- or about 120 after the light comes on.
Title: Re: Poor Fuel Consumption
Post by: Mutley on June 28, 2010, 10:55:44
Oh and you can fit 64L into the car :wink: :cool:
Title: Re: Poor Fuel Consumption
Post by: clackerz on June 28, 2010, 12:32:18
Oh and you can fit 64L into the car :wink: :cool:

Or is that a dodgy pump  :'(
Title: Re: Poor Fuel Consumption
Post by: Mutley on June 28, 2010, 12:48:08
Oh and you can fit 64L into the car :wink: :cool:

Or is that a dodgy pump  :'(

Nope :) Just fill it right up the piping until you see it sitting there, then put the cap on. 53L is the tank only.
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