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My poor neon has never had NON E-10 gas so I do not have number for it, but previous cars were closer to 7% loss. YIKES. Then of course you always seem to get that one tank or two a year that get like no milage YUCK.
Okay well not to beat a dead horse to death, but in my lastseven tanks of gas, 3 of them were "pure" 87 gas and the other 4 were 89 with 10% ethanol... and I got about 60 miles more out of each tank with the 89 with ethanol, so who knows...