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Hey everyone.I just programed my truck with hypertech pwr prog. (2500hd 8.1L cc).My question is When it asked me whether I wanted a 87 or 93 tune I picked the 87 being her in ca the highest octane you can get at your regular station is 91 could I have used the 93 tune with out detonation?Or is it a trial and error thing?

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