E85. There's about 4 gas stations within 15 minutes of here that have it, and there's many more throughout the state. Many people here have been running it for years without any problems, and seem to be making about 30 whp more than on 91. The cost per mile is a few cents less too, even with the reduced range per tank. It's also why I'm going the AP route, so I can switch on the fly between the 91 & E85 maps, but it's at the cost of cruise control.