Quote:
Originally Posted by humfrz
I suggest you check your fuel mileage the old fashioned way - with a pencil and a piece of paper. Check at least 3 tanks full.
Sometimes, those electronic things lie - 
humfrz |
I check it both ways and find the car calculated MPG is very accurate. That is, assuming that the car calculates correct mileage, which is sketchy, because GPS MPH readings are always lower by 1 or 2 MPH than what the digital speedometer says it is. So, even if your using pencil and paper, you're still relying on the mileage that the car calculates which may or may not be accurate.