ib516, glad you are happy with yours. I'm making about the same move as you. When researching and calculating, the 6.4 made more sense for me too. I'm no longer towing heavy but am carrying heavy so needed the payload capacity. One look at the new diesel on a chassis cab revealed all of those sensors and emissions item which just yelled $$$$$$$$$$$ to me in the future after warranty runs out. The gasser will be a lot cheaper to repair if necessary.
I do have to correct you (or was it someone else?) that today's gassers pull just as good as today's diesels. That statement is wrong. But from everything I'm reading, today's gassers pulls just as well as the diesels we are giving up.
In regards to the Ike Gauntlet pull, I have no worries as the system was designed to reduce long term failure on the drivetrain. Notice that the rpm was held constant. My first thought was when they hit the steeper grade right before the tunnel, it would slow down but instead held the same rpm which showed it was computer holding it on. No need to run the engine back up to redline just to upshift, loose rpm in 2nd, drop back down to 1st then repeat. As soon as the grade eased off, the computer realized due to throttle level to maintain speed that it would be able to continue accelerate in 2nd, it let the rpms run up and then shift to 2nd and keep on going. Think it was some very smart programming on their engineers.
Really looking forward to when I finally get mine and start putting it to use.