Quote:
Originally Posted by Grady
I agree the gauge is reasonably accurate. As most are now. They generally have them programmed to be a little optimistic. Mine is about +1. If he does the real gas mileage way he can eliminate any issue the car is having calculating. Not sure how it would be off but it is possible.
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Not sure if it is a programing thing or simply the fact that it measures more accurately when the car is not moving. You of course can not calculate idle time manually so instead of being reflected in the result it just sort of gets buried in the total which would of course be reflected by slightly worse mileage readings.