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I work at a Chevron refinery and can tell you that all the teir 1 gas stations are giving you the exact same gas. All the refineries send their gasoline to a terminal where it is blended in large tanks based on their Octane specs. Then when a gas station orders fuel, the delivery trucks are filled up with the gasoline mix and any detergents are added based on the delivery location (I.e. Techron for Chevron stations, NiTRO+ for Shell, etc.)
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