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Your eng will be eating pistons instead of chevys if you use a fuel with a lower octane rating than 91. It's one of the prices we pay to play ......even if you don't race it.
Dude, you bought a $32 truck to play and have fun with it. Why give it anything less than the best? On a supercharged beast, why risk ruining your engine? The consequences might not be as bad on a N/A engine, but these are supercharged.