Living in an Oil state, I understand the government angle. But, how long do you think you would have to run E85 to pay off the cost of the installation, parts, and possible repairs to your fuel system with the drop in gas mileage per gallon?

You still have to consider the extra stops for gas you will have to make due to getting a few less miles per gallon. After 12000 miles how many times would you have to fill up with E85 vs. fill ups with regular unleaded 91 octane?

It also sounds like the increase in octane is off set by the fact that E85 contains less stored power than standard fossil fuel. So maybe you will break even in that area. So the E85 will not give a noticeable increase in power output?

Alcohol is a sugar byproduct, right? I know that I wouldn't put sugar in my car.

Just trying to learn as I go.