Find a gas station that sells 100 octane race fuel. They are actually quite common. I tried octane booster and had no results. If you mix half race fuel and half 91 octane you get 95.5 octane. That seems to be the sweet spot for my 370z. I tried pure 100 octane but it didn't run as good as 95.5. There are many octane calculators online. You can mix 91 and 100 to achieve whatever octane you want.
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