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Well I've had a 2011 and now a 2018 Duramax Dually and when not towing or in Tow Haul mode will shift into 6th in the low 50s. When towing heavy 19.5K and in Tow Haul neither would shift into 6th until 62 - 63, so I cruise at 65 which is right at 1600 - 1640 RPMs.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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