least 25%, and running E85 since October 2013. I've maybe gone a week without high levels of ethanol in my tank during that time, just because I was in an area where ethanol was unavailable. Absolutely no fuel related issues. There are several YouTube videos that I have linked in the past that show the corrosive effects of components in gasoline. You can search for them on this site. Aromatics are very corrosive, and Toluene is one. The injector problem was due to aromatics not ethanol. They sell Toluene as a solvent in metal cans. They sell ethanol in plastic jugs to drink. Search this site. All the issues you bring up have been addressed many times.