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You're missing the fact that most people who buy octane booster don't understand how to calculate the true octane in the tank.
Let's say you had 9 gallons of 87 octane and added one gallon of 114 octane Toluene (a pure hydrocarbon, used to be used by F1 teams back when they were making over 1200 HP). Well, 9*87 = 783. 1*114 = 114. (783 + 114) / 10 = 89.7.
By spending $10 on a full gallon of Toluene, you only raised your already half-empty tank by 2.7 octane points. In the US, that's the difference between regular and mid-grade. People who dump in a few ounces of anything are totally kidding themselves.
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