Where are you located doug? i'm in northern Michigan, they also sell rec. 87 and 91 ethanol free fuel up here to. I run 110 race fuel or 100LL avGas in all my quadracers the others get rec 91. I think on a stock bike you should be good with the rec 91. Get the squish cut properly on the head, when you freshen the engine, it is a definate improvement on reliablity and will be more responsive and less likely to detonate on lower octane fuel. If you start modding the engine to much, you will have step up to the pricey stuff fuel wise.