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Correct, it has been 93 since the 17 6.2 vehicles. 91 will be fine, 91 with E10 will be better. 93 and or 93 with E10 would be the best if they are around.
Most of the year you wont have any problems, during the summer months when the IAT values tend to be higher is when the 6.2's start to still see knock while on 91.
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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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