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There are a few places in CA that have 93 if they are close to you I don't know. Here in NV we have no 93 any where. So when I fill up my tank with top tear 91 I go to rebel now arco and put in 2 gallons of 100 octane unleaded street fuel. I know this is a Sunoco race gas it is good stuff. This will bring my octane level to 93. Do not use any additives that clame to boost octane. If you can't find any 100 or 93 make sure you use a top tear gas and you will be fine. Of course you can always order some from online and have a drum delivered to you and then you can just mix it your self.
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