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Unfortunately, no. The scangauge uses air flow and calculates fuel usage from that. If the car runs on a different fuel/air ratio, or like yours, a variable ratio, it will be incorrect. The problem is that the actual fuel injector information is not an OBD-II spec data point, so none of the carmakers report it.
Can you not measure the Bio as you fill it?
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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