Like you, I have done research on E85. It is all over the place in Kansas, imagine that? Anyway, there is a great deal of confusing information out there. First of all, there is a difference between ethanol and methanol. Methanol is death to rubber, etc. Pure ethanol is not. On the other hand, the product that producers use to "denature" (that is undrinkable) has been known to have some corrosive effect. One article said since the 1990's fuel pumps, etc have not contained components that were suseptible to E85. The recommendation of this article was to research out your vehicle. Since our's is an Auzzie, I do not have a clue. I contacted an outfit back east and they said that GM is E85 ready except for changes in timing, fuel mixture (it takes more E85 than gasoline), etc. those are controlled by the ECM. They were recommending a piggyback computer to attach to the stock ECM that would do all of that with a throw of a switch or it would be come transparent if the person went back to gasoline.
Admittedly I tried 40% E85 in a gestimate test. In about 100 miles the check engine light came on, too much for the O2 sensor. I went back in and filled up with 93 octane and it went off.
Best of luck. Keep on researching and you will come up with a lot of information that will confuse the HELL out of you. If you come up with something, please post. I am interested too.
