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In your case just use the 91, sorry you don't have the 93. From what I've heard in Cali they use better additive in gasoline than our gas in the southern states( I may be wrong).
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Joined: Jun 2006
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From: 2 CAR LENGTH AHEAD OF YOU!!!
i run c16 120 octane @ $9.00/gallon minimum gas in japan is like 100 anyways just a off topic thing elevation has to do with this too if u live in like colorado u know what im talking about.