Watch the MPG and Loop gauges together. It should go to 9999mpg at the same time as it goes Open Loop. Adjust the cutoff until they match.
I use 10 gallons. It really doesn't matter, though. The only thing that affects is the miles / gallons remaining.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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