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Back when both were available in this area, my Civic showed a 3% mpg drop when using E10. Now that's all we can find here, so I can't test with my Fit. I have tested 87 vs 93 and found no difference, so I expect any variance would come down to the ethanol again.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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