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Even my car's on board trip computer is off by about 4-5% everytime. No device can measure MPG accurately. However I love how my scangauge is now accurate to +/- 1% after several calibrations. I just love this piece of hardware.
9999 MPG is normal, that means fuel cutoff. You have to set your fuel cutoff settings up first. It should be approximately 4 points above your TPS value at idle.
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