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

"After all, with a 60 hp advantage, the Duramax should have mopped the floor with the Cummins on the last supper Ike test instead of being less than a 15 second difference."

Let's not forget the GM's combined weight was less, oh yea combined with the new Allison "Branded" trans with all the magic gears. ;)