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Urbanpiolet has it right.  Chevron gas is the best.  For example, all of the big three bring Chevron gas up from a Chevron Kentucy refiner to do their EPA testing.  If you go to a Chevron station, they have brochures that compare their gas to the competition, for Techron additive, and valve deposits, before and after.


Also, octain levels are also geographical measurement.  For example California supreme may be 91 octaine while Denver may be a 93 for supreme.  The difference is the alltitude.


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