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From my experience calibrating an MPGuino and a ScanGauge, I'd say that it's best to drive the longest distance you can for the distance calibration. I have a 55 mile commute which I've used to calibrate them. But when I do the 300 approx miles drive to Watkins Glen each year I calibrate over that distance. Four miles doesn't seem nearly long enough, even if you were to stop and start the car right at the mileage posts.
I use a GPS to get the distance. I ignore the car's odometer for that purpose.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
Last edited by brucepick; 01-06-2013 at 03:31 PM..
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