Afm and the 6.2 is very hit and miss. My current 11 Denali 1500 has it. My 11 6.2 Denali Yukon did not. They honestly got the same fuel mileage. Ex got the Yukon i kept the truck. Still have it still beat it. Like I said previously only used a little 93 octane. It dose seem to run better towing or long trips. Day to day it gets 87 drives 120 miles a day.
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