This is a question for the more technically inclined (engineers and the like perhaps) regarding ethanol content in US gasoline. Due to the ridiculous EPA mandates all fuel in my Sunshine state contains up to 10% ethanol. I belive the R8 manual says that up to 10% ethanol is permitted for use but I suspect that in addition to reducing fuel economy there are other disadvantages including reduced performance. Can anyone speak to this issue? Are there any higher grade fuels that are available other than racing fuels?