Currently I am in the middle of rebuilding my quad, putting the Lukes 450 kit, new valves, that type of deal. I know with the 450 kit I will be running 13.1-1 so I'll need about 100 octane. Has anyone run E85 in their quad sucessfully. What type of modification do you have to do if any? Since I am also planning on racing the quad, is this against any rules? I believe E85 is about 105 octane, and at least a buck cheaper then regular gas. What do you guys think???