Originally Posted by bigdog7373
Ehh i was hoping to get at least 18. U think if i drive easy, put the intake and exhaust on, and keep the fuel filters and such clean i could hit that mark? My dad's dodge dually with a 12 valve cummins gets 20 average so i know its not unheard of.
Couldn't tell you. My only experience was with a Powerstroke in a dualie,. The dualies add some weight as well as more rolling resistance compared to a single rear wheel.