Once you get it calibrated, write down the offset on the fillup screen. You can re-enter that later and you're all set. Just do the fillup process, and then do it again, and the 2nd time you can adjust the % offset.
I do this every time I move the unit between cars, which is fairly frequent.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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