Let's see now -- corn ethanol is expensive, grossly inefficient, damages engines, emits more carbon dioxide than gasoline, and increases the prices consumers pay for groceries.
So can you explain why it still gets huge government subsidies?
Here is a great little article (with nifty pass around information) explaining why you should not be burning ethanol but why you should be writing your congressman with a message to end corn ethanol subsidies ASAP.