Don't run less than 91.
1) the motor is tuned from the factory for 91.
2) the motor is a high compression motor. Anything 10.1:1 or higher NEEDS 91 to run without detonation.
Also, don't use 89 or 87 and add octane boosters. That will not give you enough octane. Those boosters say "5 points", but in actuality, those boosters increase the octane less than 1 point. Usually 0.5 points. They're not worth the money in any case.
91-93 octane is optimal.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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