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It should make a slight gain, but it depends.
What is your engine/car combo now? What does it run? Is E85 available near you? Do you plan on running it in the winter? Winter mix (70-75% ethanol) should not cause you any detonation issues due to your "low" CR and octane requirement, but it will require a tune-up adjustment (mixture) when you change from 80-85% to winter grade.



The motor is a 9.7 to 1 compression 418 with Indy 360-1 heads, a bullet roller cam, and a 1000 cfm Pro systems carb. Its in a 72 Scamp and runs 6.60's on motor and 5.90's on spray. I mix some 110 with the pump gas when I spray it. Any issues or problems with running E 85 all the time?