My experience is that with 4.30 gears the gas mileage would have been far better. They mentioned in that video that the F-250 only hit 3rd gear *once* on that pull, the rest of the time they wound it out in 2nd. I only pull a Jeep with my truck and camper so it's not a fair comparison, but on steep grades I'm usually in 3rd or 4th most of the way, and I've never seen anything as low as 2.8 MPG.
After Jeep Safari week in Moab next week I'll be heading to Denver, so I'll be able to travel the same exact route they took in that video. I'll report my findings.
Sorry to dig this thread up from the shallow grave. So how did your truck perform from Moab to Denver on that long stretch of hwy following the Colorado river? Were you able to pull the hill in 4th gear?
Ah right! Unfortunately my plans to test my truck over the Eisenhower Grade fizzled when my Son announced he was flying into Las Vegas for business and I re-routed my Vacation to the south after EJS to go have dinner with him one night. I hadn't seen him for a while and it was great to catch up in person.