Recommended by Seb, I have used LiquiMoly octane booster. 2 cans per full tank, each can costs about $11 dollars and the car does run a lot smoother due to shitty California 91 being... shitty. I've been wanting to mix a small amount of E85 to see if it would benefit me on my high octane map like lj909 said he does, not sure how it'll be on a stock fuel system.
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