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There is E85 here. That was choice 3 but last choice. I want to add a lid and pulley, then tune it. And when tuning, either do E85 or meth kit.

I live in Vegas. There are no real fuel stations. 91 octane is “premium” here. Long story short….I just bought a 2018 CTS-V, 4,800 miles. 6.2L supercharged. It’s stock. Owners manual says “recommend using 93 octane”…..”if no 93, use 91 under loss off mpg and loss of performance…..may cause...