Hey GR:
The octane rating of a gasoline has nothing to do with the power it provides. Octane rating is a measure of the fuels ability to resist detonation due to heat and pressure, nothing more. Gasoline engines actually burn the fuel/air mixture rather than explode it. The spark sets off a relatively slow burn of the mixture. That's one of the reasons ignition timing is advanced as the RPMs are increased. If you are not experiencing knock you do not need to increase the octane.
Stop watching all those snake
oil adds on TV which promise more power and better mileage!
Bob