Octane is added to gasoline and it slows the burn or detonation. Higher octane prevents preignition, so higher ratings are needed for higher compression engines. Higher ratings, the slower the burn when ignited during the compression burn cycle of the piston. In short, more octane does not equal more power. It seems that a lower octane rating, since it burns faster, would make more power. However, you should run a high enough octane to prevent the bike from pinging. What do you guys run and think?