Quote:
Originally Posted by Zebster
The coefficient of thermal expansion for diesel fuel is a tiny 0.00083 per degree Celsius, so it's probably not temperature related. Pump calibration will have a tolerance and I'm guessing that this tolerance is actually quite high?
As a matter of some urgency I recently had to fill my tank with cheap Co-op diesel of unknown origin instead of the usual BP Ultimate. After a 400 mile round trip the MPG is significantly better than usual.
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Chances are the 400 mile round trip was what caused the increase and not the fuel.