Lower vehicle emissions.
Better performance. E85 has an octane rating of 105.
Renewable, nonimported energy source. Ethanol is derived from corn.
Overall costs higher. Ethanol has only 80 percent of the energy density of gasoline. You have to burn more ethanol to go the same distance as gasoline.
Limited infrastructure. There are only about 40 ethanol pumps in the United States, mostly in the Midwest.