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Yeah, California sucks. Gas is expensive, no 93, can't own a gun, etc.
Anyways, if you have a 100 octane gas available to you, and you only add 1 gallon of 100 octane that would only bring your octane to like 91.7. You probably need to add 3 or 4 gallons to get it to 93. A pretty expensive proposition to do it regularly.
With my Si, I knew the dealer would put 87 on that car, and even-though that's not detrimental to an Si like it would be to an 86, I still wanted to make sure the octane was always 91+ in my tank. So what I did, was let whatever the dealer put in there run nearly dry, and then I went to a 76 station that sold 100 octane. Bought nearly a full tank of that, to bring the average octane to 91+. And from then, my car has always been filled with 91 Shell, Chevron, or 76 only. If you live in CA I would recommend you do the same.
If you have any doubts about what the dealer put in your car, just play it safe and assume it was 87.
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