2015 powerwagon 6.4 with hemi fever tune review

[loveracing1988]

What kind of gas mileage improvement have you seen? Are you running the 89 or 91 octane tune? I've been running 87 as the premium on 89 and 91 up here is ridiculous, but will probably give the 91 a test and see if the improvement offsets the cost.

It depends on your driving style I think. I have went back and forth between the 87 hemifever tune and stock and whatever you gain is within the margin for error (weather conditions, driving style, etc.) I tried the 93 hemifever tune as well and you will never gain enough mileage to offset the 50 to 70 cents per gallon more you spend for premium.

Sent from my Nexus 6 using Tapatalk