Nothing really to add to that statement, just thought I'd let you all know :)

128 miles average 54 MPG - relaxed cruise @ between 60 - 70 Mph.

Driving like my grandad rules when diesel is averaging £1.30 a litre.

How do you do it man!? I have the same model as you and have never bested 40mpg. Oh well.

For a second there, I thought you must be crazy...then I realized you guys get to play with the diesel models.

I have managed to pull this off on a few occasions now and tbh it does feel like I'm driving in slow motion but I am not the slowest on the road even at 60mph..!!

I'm surprised how much people have slowed down on my stretch of the M1 since the price hike.

Was that according to the pump and odometer or the trip computer?

You should point out those are Imperial gallons which are 20% bigger -- so it would be 45 MPG using U.S. gallons which is still 50% better than us gassers can do at slower speeds.

I was thinking the same thing when I saw the title. Sounds nice. Wish I could get my Elantra to do better then 30.

Good point, Imperial gallons are 20% larger than US gallons and this figure is according to the OBC, I suspect in reality it's slightly less.

If I do the pen and paper calculation from full to empty the best I have managed to average so far is 47MPG (imperial)

47 is about the same as Hyundai's quoted extra urban fuel consumption, pretty good if you can get close to that.

Today, I drove 277 miles, 20 miles urban, rest dual carriageway and motorway at 70-75, me and two teenagers plus a bit of stuff in boot but not maxed out. No roof bars on but permanent tow bar fitted. Usually drive with lights on and air con working all the way. Trip comp says 36.5 and that's consistent with similar journeys where I used pen paper and odo. As I wasn't even booting it on this journey, I can't see how I can get close to 47 let alone 54.

To get 47-54MPG, are you driving unladen with lights and air-con off and only accelerating really slowly from a standing start? Do you always keep the revs below 2000rpm even when accelerating?

What I'm getting at, is if there is not anything fundamentally wrong with what I'm doing then there might be something wrong with the ECU.

Edit; Do you have one of the earlier 2nd generation Santa Fe's? Is it possible that the higher MPG figures come from the earlier 150 BHP engines and the lower ones from the later 155BHP engines?

This post has been edited by StoneIce: Jun 7 2008, 04:24 PM

To answer some of your questions, The journey I calculate my MPG figures from is 128 miles, 120 of which are motorways. My acceleration is within what I would class as normal driving, ie not thrashing and going over 2K revs (approx change at 4K ish??)

The car is unladen,AC off, no lights, with just myself in it, I still have the roofbars on and drive at between 60 - 70mph.

I wonder if the fact that I have the old euro III engine makes any difference? I think it's the 150bhp??

Also I can now consistantly get over 48Mpg according to the OBC on this journey, if I drive at this avarage speed?? it's not a freak one off!

I am really pleased with this return and hoping not to find out it is a faulty ECU on either car. (I especially hope it's not mine!! :thumbsup: )

Just out of interest did the actual engine change between euro varients or did they just introduce extra features to the euro III?

And is it a Hyundai supplied and built engine or is it borrowed from GM or Peugeot etc and fitted into the santa fe by hyundai? Perhaps if this is the case we might get to know what the engine actually is and find out any eco tips etc??

Anyone on the inside got any clues why figures could differ so much??

Thanks dannsaaf. I managed 38mpg on the trip to town and back this evening (~18 miles) driving like a grandad and sticking it in fifth everytime it got to 30mph. Best mpg I've had on that journey so far.

I might try travelling at 60-70 with the air con off and lights off (in day time only in case anyone asks!!) when I'm on my own on a long journey and see what difference that makes. However, it's unlikely I will ever be travelling long distances on the motorway unladen though.

Anyone seen the What Car? online article on fuel consumption and driving style? Interesting reading.