I have a 2000 CC Dually 4x4 4.11 gears and a six speed I have a K&N cold air kit, 4" MBRP Turbo back and a Edge programmer. I get 15-16 on a mixed tank I need it to be much better maybe in the low 20mpg range, I don't pull that much any more and when I do it's just a 18 ft car hauler. What do you guys think?
Thanks
BOOSTBROTHER