Keep in mind that a higher octane rating, by itself, doesn't make the engine run better. A higher octane fuel, common mythology often notwithstanding, is not a more potent fuel with some higher amount of latent energy in the mix. Higher "octane" (if that is the only difference) just means it's more resistant to detonation. Octane ratings are just detonation indexes.
If you use a fuel that is more resistant to detonation and then make tuning changes to take advantage of that difference you might gain performance. Dumping in a higher octane fuel by itself doesn't gain you anything but a lighter wallet though.