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The shop that did my supercharger install swears by 93 E10 for their builds. My understanding is the E10 they add to the 91 doesnt reduce the amount of gas used to make 91, it is in addition to the 91 octane the gas is already rated at.
Also it has been proven many times, those octane booster products in a bottle dont work well at all, much less not to the amount they suggest. If the bottle says it will raise the octane "1 point" that doesnt mean it takes 91 octane to 92 octane. It will raise 91 octane to 91.1 octane.
There is 1 brand of octane booster most of the high HP guys use in our parts, but that stuff isnt cheap at all per bottle.
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2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp
2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD
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