According to Gasoline gallon equivalent - Wikipedia, the free encyclopedia
those numbers exactly match the BTU content of the two fuels - E85 has 71.8% the BTUs of gasoline. Interpolating E10 between the two gives you 3.3% lower mpg for E10.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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