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Gas

I am getting some detonation on occasion on low RPM under load on acceleration. Just began occurring in a couple of my cars at the same time. Maybe could be crapy gas as I got the gas from the same station (says 91 octaine on the pump, but some how I doubt it). Is 91 the highest octaine that the common gas station has here in Southern CA? If that is the highest, anyone know of a good source of racing gas in Orange County CA?
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