Just to expand on Mike's comments, and put some math to it for you who are open to learning;

Numbers vary, but the prevalent ones say ethanol has about 60% the energy content when compared to gasoline. For mathmatically challenged that means that if you go 10 miles on a gallon of gasoline, you'll go only 6 miles on a gallon of ethanol. Given that E85 has 15% gasoline let's factor that in, so you'll get maybe 6.5-6.8 miles. For those myopically focused on the price per gallon you get a real kick in the wallet with E85, not even counting Swifties example.

The second kick in the wallet you get is by hidden cost. There's a measuring system for various fuels as to their yield of energy versus cost. The "ideal" is to use fuels that yield 5 to 10 times the amount of energy it takes to produce them. Ethanol, depending on the location, process, and crop yeild has a value of .7 to 1.5. Again for those who might not get the drift, at .7 that means compared to $1.00 of energy cost to produce it, it yields 70 cents worth of energy. Yes, it loses money producing it. That's why federal money, my taxes and yours if you pay them, pays a huge company like Archer Daniels Midland to produce less energy than they consume. Why? Because people in this country are too lazy to learn reality and only buy the BS about "screw the oil companies, help the poor farmer, become energy independent, and all the rest of the 'vote for me' BS". Note, ADM is not a family farm. (I don't support broad attacks on business in general, they are what employs and grows this nation, but I also don't support corporate wellfare for those few abusive companies). Of course the new, so called, Energy Bill we just got through congress increased this subsidy. And both parties are pandering to the uninformed voters on this one, so save your "I hate Republican or Democrats" rhetoric. (Pretty cranked up about this aren't I? )

There's a lot more, but people would rather panic and be buffaloed.