Too soon to say in my Fit, but in my old Civic, my total error between Scangauge and actual pump gallons was less than 1/2 gallon per year. Once it's calibrated it can be amazingly accurate. Individual tanks would vary by a lot more, but that's the fault of the pump rather than the 'gauge. It all averaged out.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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