I was talking with a friend about using E85. He has an SCCA competition license and MANY street and track cars. He claims that you get considerably more power for E85 saying that the research octane rating on E85 is as high as 127.

He said that you have to have your engine tuned to run it but once you do it runs much cooler in a Turbo or Supercharged vehicle. The downside is a 10-20% hit in decreased MPG. He also said this will help if you change pulleys.

True?