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Originally Posted by BAN SUVS
You might notice some more power with higher octane gas, but not much. However, with a good tune you'll notice faster spool, the ability to run more boost and more timing advance, and a LOT more power.
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The only way higher octane fuel can make more power on a stock car, is if the car can advance the timing to take advantage of the better knock resistance of the higher octane fuel.
Because it's so hard to knock up here at altitude, I can't imagine a stock car hasn't already maxed out the advance on 91 octane. Therefore, without tuning, higher octane at this altitude won't gain you power.
Now if you're running an intake to lean out the car and get it closer to knocking, then the fule might help... but really the only way to take advantage of higher octane fuel is to get it re-tuned like Kevin said.