I played with E-85, and the engine did run cooler. I did not change out my old cellulose fuel filter, and the E-85 caused it to fall apart and get into the carb. I used that as an excuse to install the FiTech EFI, with new high pressure pump and stainless steel screen fuel filter. Currently running gasoline, but I might try out the EFI with the E-85 again. Just need to install the larger Walbro 450 lph pump that is good with E-85.