Best way to deal with the issue is to compare your odo with the distance marks.
For example you drive for 20 miles/km and you check your odo in comparision with your MPGuino, or any other device. Then you calibrate it to show the proper number for the traveled distance.
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Quote:
Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
Vic Hickey's son, Jim, manufactured an "add-on" digital box for GM products that connected between the wheel sensor and ECM to provide digital "calibration" of speedometer readings.
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