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On my first tank of Costco 92, and I'm pretty sure any performance issues I'm noticing are me learning the car better, not the switch from Chevron 92. Certainly that one tank of Shell 92 Nitro Power made no discernable difference except in my wallet... maybe if the Shell station had been easier to get in & out of I'd keep trying them, but they're down low on the water table too, which I always try to avoid.
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