Bossman1
Registered Member
I own a 08' 2500 4 door short bed with the 6.7, 6 speed manual and 3.73 gear, 4x4 and it gets about 13 mpg in town and about 15-16 highway. Once the warrany is up I will be deleting the DPF and the EGR which will help dramaticaly. From what I have been told is that the 5.9 and the 6.7 share the same block but the 6.7 was bored and stroked with new emmisions. Once the dealer reflash my computer TWICE I have had no trouble with it and am very happy with it. Oh and the factory exhaust brake is pretty sweet.
Then again I tend to get things done a little quicker. He claims he can get the overhead to read out at 17 mpg, that's fine cause I can get it to read out as low as 9 mpg. 
