I always use the combined figure, I usually find that I can exceeed that figure by a couple of mpg once I'm used to the car, but it does as a guide to what I can expect.

No published figures can be accurate for a particular individual, we are all different in the way we drive, so whether you use the manufacturers figures or one from a website they will not neccessarily match what you will get in real life. So they can only be used as a comparison, and I've found that the combined figure does work for me, as a comparison... you may be different!

I use brim to brim to calculate mpg, once I've done that from several fill-ups I can find out ghow accurate the computer is and then use that in the future. I've found that the original Fabia I had the computer was dead on, but the second one and my current Roomster are both about 7% over... I'd suggest that if you try to use one without checking it by brimming that you take 10% off the figure, that way you will not be dissappointed!

TBH the only way you can really tell what the mpg will be is by taking an extended test drive (over a weekend) which will give you sufficient mileage to see how they are... Just make sure you zero the computer before you start!

With all due respect to that fuelly site,,, I drive a Roomster 1.9TDi and have NEVER got below 48mpg (and that was driving accross Europe at Autobahn speeds with aircon on)... what that person is doing to his to only get 35mpg defeats me!

Edited by b308 on 29/03/2010 at 23:02

I always work on combined figures: and do 2 -4 mpg worse on average due to mainly short runs.

Yep, thats all it is... but it gives me something to aim for!!