Higher octane gas has more double hydrogen bonds and therefore resists combustion better. It is only used for high performance engines with higher compression. Since the fuel will not auto-combust at high pressures, you can compress the fuel mixture more, which burns more efficiently, making a larger explosion and creating more power. You don't have enough compression in your engine to make use of this effect. Actually, it has a negative effect since it will retard the ignition timing. I AM WATCHING YOU!