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I too was once on the verge of returning my Maxitrip, but I finally got it figured out.
There is one major bug that throws off a lot of the Maxitrip's calculations. The distance driven is based off speed, but for some reason it's being multiplied by approximately .75. Miles per gallon is calculated using distance, so if the distance is wrong, almost everything is wrong.
To fix it, adjust the speed calibration value so that your distance driven is correct. 1.32 is a good starting point. Obviously your speed will no longer be displayed correctly, but you have a speedometer in your car already so who cares.
After doing that, my mpg readings are very accurate (within 1% of what I calculate when I fill up)
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