That's the octane booster I run, Glenn.
Not cheap - but it allows me to run 91 octane fuel on track with my 94 octane tune when 94 isn't available at a pump nearby. Sasha from Onpoint Dyno runs it - so that's a pretty big vote of confidence in the product working right there.
It contains some naughty chemicals though (notably MMT), so it's not street legal.
As I recall, I need basically an entire can to top a full tank of 91 up to 94.
Royal Purple makes a similar additive that's quite a bit cheaper and is also MMT based. Haven't seen any actual dyno tests - but the butt dyno results felt identical to me.
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