i30 Owners Club
FUEL ISSUES & ECONOMY => DIESEL => Topic started by: neoto on November 28, 2011, 09:16:30
-
I did about 450 km both highway and city driving. I will be updating this when I record even more data.
However, the preliminary results look quite interesting. What do you think?
(http://shrani.si/f/3s/yz/4twu1phC/fuelconsumptionvsspeed.png)
-
Let me comment on that 80 km/h outlier... apparently, I was driving 80 km/h downhill there. At the moment, I haven't add any compensations for the uphill/downhill driving.
-
An interesting graph. I am surprised that the best economy is at about 80 kph - my 6 speed diesel seems to perform best cruising at about 100 kph in top gear.
-
I was always told that 80k's was the most efficient speed to travel at. Regardless of the car's streamlining, wind resistance starts to become a significant factor at higher speeds. Maybe some of our aeronautical members can provide some info on wind resistance vs speed.
-
That is very interesting... Thanks Neoto :goodjob:
-
As a youngster I was told that 50 - 55 mph (80 - 88 kph) was the most economical.
-
Aerodynamic drag increases exponentially with the increase in speed, so increasing speed from 80kp to 100kph might only be 20 kph increase, the drag increase will be equivelant of 40kph. .
-
Hi
some 20 years ago I was told that when you´re driving 100km/h 70% of the power is used to overcome wind resistance.
Even though the cars are a lot more aerodynamic today, I don´t think that have changed a lot.
BR
-
Hi Neoto
Forgot to ask: Whats your overall average..?
BR
-
Here's some stuff
http://mpgforspeed.com/ (http://mpgforspeed.com/)
-
Hi Neoto
Forgot to ask: Whats your overall average..?
BR
5.5 l/100 km for the last 29000 km (and average speed of 76 km/h).
-
Hi 877563
Thank fo the link. Most of my driving is on main roads with 85-90 km/h so that´s just fine according to the link.
Hi Neoto
I´ve only had this car since april this year, my average is 5,5l/100 km at normal driving.
Our sommervacation often goes to Crotia with our caravan, that´s 3500 km with the car fully loaded and 1400 kg caravan. When driving with the caravan the consumption is 9,3l/100km, so that destroys the overall average. :'(
How did you get the consumption data from your car..?
BR
-
Welcome Asterix,
It is interesting that some European speed limits are much higher than in Australia. We have maximums of 100-110 KMH. Traveling on your freeways will obviously knock your fuel consumption around a bit. :)
-
@Asterix: I bought an OBD-II bluetooth dongle on D***Extreme and Android Torque application from the Android Market. This combination enables me to record selected sensor readings and export them to .csv file. I then import this file in Excel, calculate current consumption in l/100km, assign a speed bin to each record and use the pivot table to analyze the data. The result is shown on the graph in the first post.
@847563: look at this table: http://www.europe.org/speedlimits.html (http://www.europe.org/speedlimits.html).
-
@neoto
Thanks for the info, I wish we could get 130+ on our highways. One of our drives between cities is km of flat nothingness, called the Nullabor Plain.
http://www.outback-australia-travel-secrets.com/the-nullarbor-plain.html (http://www.outback-australia-travel-secrets.com/the-nullarbor-plain.html)
We have to do 100-110 or break the law. :fum:
-
@neoto
Thanks for the info, I wish we could get 130+ on our highways. One of our drives between cities is km of flat nothingness, called the Nullabor Plain.
http://www.outback-australia-travel-secrets.com/the-nullarbor-plain.html (http://www.outback-australia-travel-secrets.com/the-nullarbor-plain.html)
We have to do 100-110 or break the law. :fum:
At least we have 130kph limits on some of the Highways in the Northern Territory..... :D
-
That is an interesting table of Speed limits :goodjob:
-
@Asterix: I bought an OBD-II bluetooth dongle on D***Extreme and Android Torque application from the Android Market.
Hey Neoto, could you either post online or message me the link from dealextreme for your OBD-II bluetooth dongle.
Thanks
-
Here it is: http://www.dealextreme.com/p/obdii-bluetooth-car-diagnostic-cable-black-blue-orange-dc-12v-42825 (http://www.dealextreme.com/p/obdii-bluetooth-car-diagnostic-cable-black-blue-orange-dc-12v-42825) :)
-
Here it is: http://www.dealextreme.com/p/obdii-bluetooth-car-diagnostic-cable-black-blue-orange-dc-12v-42825 (http://www.dealextreme.com/p/obdii-bluetooth-car-diagnostic-cable-black-blue-orange-dc-12v-42825) :)
That's the same as I have. Didn't realise it had connection LEDs until I used it on a mates car :eek:
It is good tho... especially when combined with Torque from the droid marketplace
-
Welcome Asterix,
It is interesting that some European speed limits are much higher than in Australia. We have maximums of 100-110 KMH. Traveling on your freeways will obviously knock your fuel consumption around a bit. :)
I know I wrote that I drive 85-90 km/h on main roads, but I didn´t state that I did not exceed the speed limit :P
On main roads speed limit is 80 km/h but most people drive faster. There is not very much police on the roads, so you will be very unlucky to get a ticket.
On motorways we can many places drive 130 km/h, some motorways have speed limits at 110 km/h, so yes, that does destroy the fuel economy :(
BR
-
Today I noticed that the Torque application does not correctly calculate the diesel fuel consumption in low load conditions. There were no warnings about this in the application. Anyway, below 80km/h, I am sure that the fuel consumption is way lower than displayed in the graph. I'll be doing some comparative measurements between torque and on-board trip computer to see the true state... I'm kinda dissapointed... :undecided: