[Tourer_Guy]

Very good numbers indeed.

Does the economy decrease much if you run along at say 65mph?

Yes, previous tests with my last two i30's  - both GD diesels - indicated that on a long round trip of more than 300 miles, mainly on the M42 and M5 motorways, cruising at about 65 mph produces economy of around 58 mpg overall - especially because a DPF regeneration normally happens in this distance.

Thanks for that.

So if there was no DPF regen activity, would you expect low 60s mpg (say 62-63mpg at 65mph)?

[Lioness]

Are you using the bluedrive option when driving. 

What is the bluedrive option? autostart?

[Phil №❶]

Yes

[Lioness]

Yes I use it, but sometimes I do turn it off. Is it better to leave it on?

Update: So I have changed my drive style a bit and kept an eye on the running MPG display. MY MPG is now reading 40. I did a 20 Mile motorway journey tho, maybe that helped

[Phil №❶]

You have achieved a 21% decrease in fuel consumption by changing your driving style, that is a great result. I would use the auto start wherever possible, as long as you are comfortable with the method of operation.

[Aussie Keith]

I have got a 2013 HYUNDAI I30 ACTIVE BLUE DRIVE CRDI (109), it has 20,000 miles on the clock. I have filled it up once since I have had it and only got 365 miles out of the tank.

I am doing round town driving. I knew it was not going to be as expected, but I didn't think it would be that bad. My MPG was about 33.

Is something seriously wrong 

That sounds about right for round town driving. Round town is not where the diesel engine shows its best fuel consumption. It will improve with more km on the clock also.