Keep in mind that by raising the compression in an effort to recapture the power lost in using e85 you may be taking away the option of running straight gasoline if you need to. Let me say, I have zero experience with e 85, after looking into the effort req to make it and the huge amount of by products and the power loss I decided to buy a little diesel and make biodiesel, I know that methanol swells any natural rubber and I wonder if ethanol might have the same effect. Not trying to bring you or e85 down, just not my cup of tea. Anything to avoid sending more money to the middle east is A OK by me, good luck, Dave.