2024 Chevy 3500 verses 2023 F350

If I remember the temps correctly it was in the mid 70's going up the IKE. Which for that elevation I would imagine it is warm. What happens on a pass that isn't as long but 90 or so degrees. I am curious how the truck would respond to that. Especially when you can't maintain that kind of speed. Teton pass comes to mind. It tops out at 8500 feet from 6500 on the Idaho side. It is 10% at its steepest, but with the switchbacks much slower up the hill.