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- #41
Stantheman
Active member
6.4 l......make sure you have the latest programming update installed and i recommend going with the roush air box and exhaust on the 6.4 and should have more power and better milage the programming is key.......the new 6.7 unloaded u should be gettin at least 20 mpg......unloaded!!!!!!!!!!
I have a new 6.7 and can get 20mpg(imperial gallon) or 16.8mpg(US). Unloaded of course. Mind you in order to get this you really have to be trying for good mileage, coasting up hills, keeping it in 6th gear all the time, slowly passing a slower vehicle not flooring it, etc...