I think the issue there is that the car doesn't have any way to 'sense' the increased octane to account for it. It can sense too little octane, but only the hard/indirect way, by noticing knock and backing off to eliminate it.
Hence the need for a different flash/tune to take advantage of race gas. One of the things I like about the UpRev stuff I was reading is that they can store up to 5 maps in your reflash and you can switch them via the cruise control buttons without reflashing again. You can have an easy-going map for light driving and/or questionable fuel, an all-out on 93 pump gas map, a 108 race gas map, a valet map, etc.
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