I have a 91 and e85 on my 20g. Ej255. 350whp on 91 at 20 psi. 434whp on e85 at 24 psi. Yes mpg is less but the power difference is night and day. And it's safer to run e85. E85 burns cooler which cuts down on combustion temps along with u can run a more aggressive tune safely because of the higher octane of e85.