Quote:
Originally Posted by mofomat
How many people claiming these fuel economy figures are just going by what the OBC says? My F30 318i is extremely inaccurate, and is always around 4-5 mpg optimistic when I compare my figures after brimming the tank. My X5 is usually pretty close.
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That's interesting, my F30 335i is dead on accurate if not a touch conservative. When I first bought the car I tracked in fully for 6 months and compared with the onboard. The car was basically dead on or .1 or .2mpg low every time. So after dozens of fill ups I just decided the onboard was the way to go.