Switched to E85 last year for the octane and price. After the winter weather ended the fun for the year, I drained the cell and ran a couple gallons of pump gas through the pump and lines and caught the return line fuel in a jug. Ran the gas out of the carb, then removed it and completely disassembled it and removed all traces of any fluid. I had the E85 in there all last summer with no corrosion in the naked aluminum fuel cell, and nothing in the carb. or Al fuel lines. Don't know if I'm stupid lucky or what,but I didn't see any of the horror stories some E85 users speak of.