Originally Posted by E90Company
If you are concerned with running an E85 mix in your car, either don't do it, or run a small amount not so you can increase boost, but just clean up any timing corrections. That's the best advice I can give you, because we still haven't really seen any long term side effects yet.
That said, I wouldn't run more than E20 in my personal car.
Why? you might as well just do E25 to get more of a performance bump...