Okay, hear me out. I’m going to try to make this quick. Lol
Essentially is one more inherently fuel efficient than the other?
I’m currently have 2015 F150 5.0 V8 truck. It is NOT My Daily. My next truck will be a diesel and will be my daily for commuting on the highway unloaded (and towing heavy as mentioned more below).
Looking at years 2022-2025. I know these trucks aren’t famous for “Prius level MPG” but I want the most efficient one of my options below. I’ll get to that reasoning.
I need the diesel due to regularly pulling my camper and trailer long distances (581+ miles one way) that’s well over 1,100 miles round trip just on the highways.
I’m in the high mountain desert elevation and going from Montana to Arizona and Nevada 1-2 times a year towing a 22’ enclosed trailer a diesel is needed. I’ve been using my dad’s diesel on those trips but that’s his daily now and can’t take his. We also go from home at 5350’ elevation to the cabin a hour away at 6700’ elevation 2-3 weekends a month either pulling a boat, or 20’ flat bed trailer with side-by-sides most the time. Sometimes that trip is just unloaded if it’s only a 2 day trip and doing maintenance lol.
This diesel will be my daily also and that’s why I need/want the most efficient one when unloaded and not towing just commuting 30 miles to work each day with 18 miles on the highway.
OPTIONS: Chevy/GMC 6.6 Duramax engine or a Ram 6.7 Cummins engine?
I know the Ram is the i6 engine and the GM is the v8. I know the Ram has more torque but that’s not needed for my uses.
I’m mostly curious what will be the most fuel efficient engine while commuting unloaded?
TLDR: Unloaded, not towing anything will a 2022-2025 6.6 Duramax or 6.7 Cummins be more fuel efficient for commuting on the highway on cruise, when not towing?
Basically, is one more inherently more fuel efficient than the other?
Thank you all for your expertise!