Octane ratings vs. power produced

[NoRice]

Is there a general rule of thumb of how much more power a car will make when going from pump gas 91 to 100 octane to C16? I am going to be taking my car in for a new tune here very soon and I am debating on whether it is worth it to tune the car on a mixture of 91/torco to acheive a 95 octane rating vs. just the pump 91 gas. If it is only a minimal power increase then I dont see it being worth the hassle of carrying around Torco bottles, but if it is significant power increase then it may be worth it.

 

[Tom F&L GoR]

The SVS folks talk about their TT on E85 here:

http://www4.forum.viperclub.org/showflat.php?Cat=0&Number=781175&an=0&page=0#Post781175

By going +12 numbers from 93 octane to E85 (105 octane) they were able to bump timing 5 degrees and went from 850 to 900 HP (6%).

I don't know if ~1% HP per degree or ~1/2% HP per octane number is a good way to look at it.

If it is, then +4 octane is 2% more power; from 500 to 510 HP?