I know ethanol has a far higher octane rating as gasoline, i want to say its around 115. I thought there was someone at the death race that used e85. I lost the jet because like an idiot i put the old one on top of my engine and drove away. The reason i thought that e85 would be richer is because i believe Norm said to run on alchohol you have to drill your jet way smaller. by norman No! to run methanol you go way bigger in the hole size and across the board needle size and setting.