Ford 6.7L 1050 ft lbs TQ at 1,600 rpm, 475 HP at 2,800 rpm

If the new Powerstroke is really capable of putting out that kind of power it should be able to maintain the speed limit up the Ike with a 28000 lb trailer in tow. Based on the performance of the Duramax when it pulled against the Freightliner I think these little diesels are not able to produce their rated power over a sustained pull. Maybe it's just the thin air at 10000 feet that prevents them from pulling as they should?