Let me start by saying that my truck is not supposed to be a "flexfuel" vehicle. I have been doing a lot of reading and research about using ethanol/alcohol as a fuel alternative. I am considering making my own alcohol still so that I can make alcohol to use as fuel. To start, I wanted to see what percentage ethanol I could use in my non flexfuel vehicle so I used E85/87 octane combos. Basically any engine can run 50/50, but some can go higher. Well, the 2.2 can go higher. At 35% ethanol my truck did 25MPG driving half city and half highway. At 50% ethanol my truck did 23MPG doing 3/4 city driving. My truck now has straight E85 in it right now. Yes, I did check to be sure my truck is not a "flexfuel" truck. I have no check engine lights or any signs of sluggishness. I will report about this tank's mpg's when I am empty. Maybe this will help some people out. If you are interested in alcohol as a fuel google "alcohol can be a gas". Its a great book. Also, in my research, I have discovered that any vehicle built after the change to E10 fuel can run safely on alcohol without damaging the fuel system components provided that its not straight alcohol.