You won't really see a benefit on the cost I wouldn't think since you'll lose mileage with E85. It's just not as powerful as gas so you need that extra 30%. I don't know what it's like in your area, but around here the prices pretty much work out to be even, so E85 is 30% cheaper, but you use 30% more. It is corrosive however, and you will need to upgrade pretty much the whole fuel system. I built a race car project with it for senior design in college and everything in the system had to be either stainless steel, hard annodized aluminum (not just pretty colored annodized), or teflon coated rubber. It will eat through regular steel and rubber over time, so while you could possibly run it now I would be wary of using for long without changing most of the lines and stuff over. At the very least you need to change out the rubber lines, they wouldn't last very long.
