I posted this elsewhere in another E85 topic. I found it on ahm-ownerlink.com. I'd encourage everyone here to join. There's some good data in the FAQ's.
"Fuels that exceed the EPA's approved oxygenate percentages for conventional and reformulated gasolines must be clearly labeled on the pump. One example of such a fuel is "E85," which contains 85% ethanol. Do not use such fuels in your vehicle. These fuels will cause performance problems, and may damage your vehicle's engine, fuel system, and emission control system. This damage would not be covered under warranty."