Quote:
Originally Posted by ash_schwin
My understanding is Costco 91 is ranked as Top Tier gasoline so I wouldn't hesitate to use it for my fuel up.
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except Costco 'waters' their premium gasoline fuel down with up to 10% ethanol.
I am lucky in my area that both 92 and 94 pure gasoline - no ethanol - is available from the pump from a few vendors.