Just when I plan on needing the extra "kick in the pants"
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As fastkatt said, most don't work. And for that reason, I have never used them. They just don't raise the octane that much compared to filling your car with better gas. Your car should run fine on 92 or 93 octane. And if you are going to go to the track and think you need the extra kick in the pants, then get some race fuel.
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