For years in Cali we've had that MTBE crap...finally 76 has changed that to Ethanol or whatever and we're on the upswing again. Before that I'll use Chevron. When gas is mixed to make the proper 91 Octane for cali, it could be 87 and 94 or 93 and 88 or some other combination to give around a 91 final number. Chevron comes the closest to using a proper 91/91 mixture and supposedly this is a good thing....at least the experts say so :)
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