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I had this gauge for about 2 weeks and returned it.
Distance travelled is about 20% under. The gauge was calibrated using my GPS so I know the gauge is not reporting the correct distance.
Instant MPG is about 30% over as well compared to my MPG history.
Also the trip MPG stays about the same all the time it is always the same as the tank MPG.
It failed to wake up once and I had to unplug / replug the cable. Here in Canada it is no where near the temperature in southern States.
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