Goostoff wrote:
Looks like 10k is about it for performance on the 6.0. my trailer is right around 15k when we are on the road. My 454 gets a hell of a workout on even the slightest hill and I average 5 MPG as well. I know the LS series engines are much more efficient and all but there is no replacement for displacement. Maybe look for a truck with the 8.1 if you want to go any heavier.
HAHAHA. You don't get out much do ya? The 6.0 now days will eat your 454 for lunch and not even belch. The 8.1 was also a great motor but still not up to par with the newer 6.0.
OP, my FIL tows right around 15,000# with his 2015 and has no problems staying right with me and my '13 Cummins. He just has to let'er rev to get to his power band. Good luck with what ever you decide to go with and have fun. Also BTW, like others have said, don't let short trips steer you one way or the other as far as your decision. Short trips are just as hard on a gas motor as they are on the new diesels.