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Towing at altitude with gas engines calibrated for lower altitudes requires a bit of attitude change. Your truck will run harder, hotter, thirstier going up and down. My old Chevy 6L 2500 gasser ran between 5000 and 5500 rpm both going up and down passes. Use the cruise control in addition to the tow/haul mode and ignore the speed limits going down! Even with my 2017 2500 diesel Chevy pulling 10k Sprinter 5th wheel, going down the west side of the Eisenhower tunnel (I70) at 7% grade, I stay around 40 mph or less. Big rigs are limited to 25 mph, so that tells you something.
Jim deKieffer
2017 Chevy duramax
2018 Sprinter 5th wheel
Elizabeth, Co
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