The issue of using E85 is very controversial. Generally the people getting the big subsidies for producing it think its the salvation of the world and the rest of us can't see any significan't advantage to it. If you go to a search engine and enter E85 and Prius you will see some data that definitely documents that a Prius will make 20% more horsepower on E85 than it makes on gasoline. However the MPG takes a huge hit