Which is the better motor and why?
I understand when the 6.7 gets over 50k the mileage jumps 3mpg+. Maybe those guys will come in here and tell what their experiences are.why trouble yourself with all the emissions junk. is it worth 25hp and 40 ft.lb tq with worse fuel econemy? not in my books. adding a few hp is cheap and easy on a 5.9 and there is less to go wrong. trannys.... 1st gen with 300k and second gen with 300k, all stock with lots of towing miles and never had problems
Well for me, the exhaust brake and the 6speed auto would make the poor fuel mileage a lot easier to deal with. I hear that extra top gear keeps the motor under 2000rpms even at 75mph. That's great for mileage. I would trade mine in on a 6.7 if I wasn't so damned upside down on the note.:CRY:well to start with stock to stock the 6.7 is 2 sec quicker and to boot it has the 6 speed auto tran's with factory exhaust brake Drive one for your self and see how it feel's don't get me wrong 5.9 was and still is a awesome motor but big brother is here and we soon shall see how he run's .