[Dave W]

If you want to feel like you are rowing up hills, gas for sure. We made the same mountainous trip - once with the gas V10 and then with the diesel 6.7. No comparison. I was tired out after the gasser trip and 30 mph on long grades and a 4000 rpm screaming engine in a low gear. That diesel went up the hills at the posted speed limit and - maybe - 2200 rpm. Then there is that fuel economy. Diesel in my case was ~2X better then the V10