As others have mentioned, you won't really gain anything with a fuel higher in octane than what your tune is optimized for.
That said, I usually tossed a few gallons of 100 or 105 in with each tank of regular 93 when i would do HPDE events(lapping days) or TT. The added octane is piece of mind in case things get a little warm, and instead of the tune pulling timing and reducing power, it would let me run harder for a little longer.
$.02