agree those old big blocks are very thirsty , and they won't pull with 400 HP diesels , but they were good workhorses for their day,
I don't think putting the rig in drive , switching on the tow haul button and floorboarding the go pedal is much of a test or even a very intelligent way to drive a loaded auto tranny pickup truck
here' s another view of the 6.4 Hemi in more of a real world situation
https://www.youtube.com/watch?v=Ji9I_hmZ88Yhere's also a thread discussing I think the same truck and driver
http://www.cumminsforum.com/forum/4...scussion/1095146-6-4l-hemi-tow-test.html