Highest performance will be achieved on the lowest octane fuel possible without knock. If you run 87-octane and the engine does not knock/ping, then it will run better than if you had filled 91+.
Yes, there is such a thing as too much octane, and no..."octane-boosters" you buy in a bottle from Auto Zone do absolutely nothing.
That said, I have a hard time believing one can feel a difference with 91 vs. 92/93/94-octane on a stock car.
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