I made a post on theturboforums.com and asked about E85 in a stock tank and a few guys that have been doing for a while have had no problems and have so sign of corrosion when checked. There is a ton of E85 info on that site I just haven't had time to read thru it all yet. There is one post that has 21 pages that started with a turbo'ed Mustang on E85 from couple years ago. I plan to search more there are get more info and when i find interesting info I will post back with a link.
E85 and stock steel fuel tank, compataible or not?
E85 and stock steel fuel tank, compataible or not?