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I don't know how the UG calibration process works. They way I did my Scangauge was to keep a running tally of Scangauge-reported gallons and actual pump gallons. After a few tanks you get a really good number. Now I just set it to that and know it's right. (+10% fuel = -10% mpg for my car and driving style)
The mpguino does not use the OBD port so it can run beside either the SG or UG.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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