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Big difference between reported MPG and actual MPG

Over the last few tanks I've been using Fuelly to track how much diesel I'm actually going through. The car says I'm getting a perfectly respectable 47.6 mpg, mostly on the motorway. However I'm actually getting more like 37 mpg, which is rather less good.

Any clues as to the large difference between the two, or are they often this misleading?

EDIT: Just a thought, what kind of Gallons is Fuelly using?
Guess who feels like an idiot now, it was on the default US gallons, now it says I've averaged 45 which is what I'd expect.

Last edited by amushrow; 20-10-14 at 19:08.
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Glad you could answer your own question :P be aware that the mpg in the car can quite often be wrong.
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Short thread then.
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How do you change from one to the other?

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