GASOLINE VS. ETHANOL
Gasoline makes one-third more energy than ethanol but by mixing ethanol and gasoline at a ratio of 85 to 15 percent the new fuel is around thirty percent less powerful than gasoline. Ethanol is similar in many ways to gasoline and produces similar effects when being used as a fuel, but ethanol get less miles per gallon than gasoline.
One of the main reasons to be against ethanol is that it causes damage to fuel systems and engines that gasoline doesn't. The most important problems are water contamination and fuel separation. The ethanol attracts water from the air and if it absorbs enough water fuel water contamination occurs in the car’s gas tank and that can have a prominent affect on engine performance. If you were to let the car sit for a while fuel separation occurs; the gas and water separate into layers and if the motor sucks the water layer into the engine,a lot of damage can happen.
Ethanol is pretty much just alcohol and alcohol can corrode the metal parts and the plastic parts in the fueling system. The main reasons to be for ethanol is that it produces less emmisions than gasoline and it is made from corn. Using ethanol is a huge money making opportunity and many advocates for ethanol are calling it "agribusiness".here.