Thread: How accurate are the MPG calculations?
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Old 11-25-2007, 06:40 PM
H2O Doctor H2O Doctor is offline
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Real Name: Dave
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Exclamation Re: How accurate are the MPG calculations?
Quote:
Originally Posted by haroldo View Post
Seems like the car has to guess how much gas is in the tank and how much is being used, so the on board computer might display estimated, rather than actual calculations. Is there a general consensus as to how accurate the displayed MPG actually is?

I have slightly more than 15,000 miles on mine and have recorded the tank computer values on each fillup as well as the recorded mileage and the gallons that I pumped. The computer is high by 1.2 mpg based on my fillups. However, when I use my Garmin GPS system I find that the actual mileage on the odometer is low. Putting this information together, I have come to the conclusion that the computer is accurate within 0.5 mpg.

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