Quote:
Originally Posted by i82much
my 6.0 vortec, 6L90 with 4.10’s gets horrible gas mileage in my crew cab 2500HD. Should I pull the 505 and Muncie out of my GTO and put it in my truck to get better gas mileage?
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My father has a 2014 with the 6.0 and 6L trans with 4.10's. Empty it's not horrible but when he tows it sure is. He averaged about 8mpg pulling an enclosed 24' car trailer loaded. Oddly when I drove it across country and pulled a Uhaul 12 foot box trailer it got about the same mileage. What both dad and I disliked the most was the fact that it would constantly hunt for gears and any slight grade had that thing downshifting and screaming. It does about the same thing with an 18 foot flat bed car hauler with a 4,000 lbs. car on it. Some hills it would hold the engine at 5,000 rpm and just stay there. Made my butt pucker.
My 79 1 ton with a 454 bbc, pulled a 28 foot enclosed across country, loaded, and averaged 10 mpg, with no overdrive and 3.73 gears. So there is something to be said about low end grunt. It didn't work nearly as hard as dad's truck does.
My duramax there is no comparison to a gas engine. Empty it gets 20 mpg. I can tow the 18' flat bed with a car and get 14 mpg, and I can pull the 28' enclosed loaded with a car and get 12 mpg. But the best part is that there isn't a hill or mountain that will slow it down, and it'll pull up any grade without downshifting and just loaf down the highway at 2,000 rpm with 10,000 lbs. behind it. Generally I'm passing cars in the slow lane when climbing through the mountains, lol. It just makes loads of grunt everywhere.