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First as said, make sure it "unleaded" only fuel. Some of the higher octane stuff can be leaded aviation fuel.
Also you really don't need a full tank of 100/104. The can wont run any better from it and could actually run worse on it. The higher the octane the slower the fuel burns to combat detonation. We don't get 93 in Oklahoma anymore so I run 6 gallons of 100 octane and then the rest is 91 octane to bring me up to around 94 octane. That is plenty for what a stock car will need.
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