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Regular unleaded is what you buy at the normal gas station. There are usually three levels of octane(87 / 89 / 91 / 93). Ok that's four, But I can't remember what the exact three are. So you get the idea "91" is just an Octane level of the fuel. I hear it's hard to find unleaded 91 in some places of Florida. Also the newer Vehicles usually ask for the higher octane. Hope I helped ... kub
What else can I help you with?
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" premium " unleaded , 91 octane or higher
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