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Originally Posted by goochman
Does anyone think the onboard computer MPG is accurate? After a few years with one in my Grand Prix I stopped looking at it since it was usually off by 2~4 mpgs. My BMW one isnt that hot either. It might be good to show off to friends but its day to day usefullness to me was 0.
I once got my Grand Prix MPG indicator to get up to 99 mpgs!
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We have one in our HHR, I tested it twice to verify how accurate the onboard computer was, and both times it was 100% the same as my own calculations, down to the tenth of a mpg.