HowardH bases on your last 2 comments i think you either have no idea of what you are talking about or you are just being difficult.
1) no engine that has been tuned to go into a truck likes to be run at its max rpm.
2) putting higher gears (I would of said lower) in will not get you there slower, unless you way over spec it that it can not even take off in first gear and even then you could not even buy something like that.
3) CAT, Allison did not build that engine or tranny for that truck, they were for the price the best suited items thay had on the shelf.
4) When looking at a truck engine you look at torque and the usable rev range of that torque, HP just comes with it. You cant buy a engine with all torque and 0 HP so im not sure why you even bothered with your last post.
Back on topic very very nice truck and a decent mpg you must be very happy with that.