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stewie:
wow thats nuts
I assume that all cars that have this type of info built in are off as well, as there are way to many variables to take make them 100%, I would assume maybe 90% accurate.
I switched to metric yesterday as my car is in kilometers, that way I can calibrate MPH more accurately, it seems to be very accurate.
So I will test mpg next, close is all we can count on.
I mainly use the mpguino as an instant and trip MPG tool, the actual MPG is calculated from the gas pump and the odometer and now the 2.5% tire size difference.
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2000 Insight MT 106K Citrus A/C 
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