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You can try hall sensor or contactron and a magnet attached to driveshaft, or maybe two if you want to have more pulses per mile. You can also use a set from bicycle speed/odometer.
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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."
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