westend wrote:
No one is losing 10% in mileage by using an E10 gas blend.
I have no reason to doubt the OP's results but some of his mileage differences may be due to the intrinsic construction of the engine and it's fuel management accessories and not absolutely due to the addition of alcohol.
Funny that. Gasbuddy.com held a poll on users mileage loses due to using E10 fuel. The largest group responding said they lost between 5% and 10%, the second largest group said they lost between 10% and 15%.
Then from the website of a little magazine called Road & Track I find ".... switch to E10 (gasoline cut 10 percent with ethanol), your mileage will drop. The big question is by how much. The Environmental Protection Agency says E10 lowers mileage approximately 3 percent, which would drop your mileage from 19.6 to 19.0 mpg. Instead you're citing a drop between 10.2 and 15.9 percent, which, while similar to some E10-induced losses we've heard of, does seem large. We typically hear of mileage drops in the 6- to nearly 10-percent range..."