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Just gonna throw this out there, NASCAR uses "one brand of fuel" because that's the one that paid the most to sponsor themselves in the races. And while they may supply the actual fuel for the races, it's more of a promotional thing, not for performance reasons.
Back to the OP, seems like you already have your mind made up that their gas isn't really 93 so why not go elsewhere and get it? If you can't get 93 octane in that town, go to the next one then. 93 octane is everywhere. Big problem is, around here at least, that every station has it priced differently and most don't advertise it.
And as for your perceived performance increase while traveling, I'm willing to bet its more from change in temp or humidity which can change your performance quite drastically as well...
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