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2017 AWD durango GT 3.6
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I've heard that high octane gas wont do much in a hemi unless it has a custom tune to take advantage.
Yup but it will prevent any timing from being pulled do to knock. When I ran 93 in my JGC 5.7 I barely saw any knock but on 87 it was knock knock knocking on heavens door (more like pings) on hot days in traffic.
 
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