Pretty sure E85 has ocatane rating of 105.
In this thread I ran multiple blends thru the Stratus.
http://ecomodder.com/forum/showthrea...nol-18896.html
Almost unbelieveable corrilation between energy content and MPG, yes just one 14 yo car but those are the results. When petro hit's $5 in 2 months E85 shouldn't keep up. I'll be running the highest blend Stratus will allow.
My next car is going to be a Cobalt, new HHR's are FFV with the same engine, I doubt there are many different part numbers. But I'll find out for sure once I buy one.