We've had 2-2022 Silverado's with the 3.0l Duramax and very satisfied with its trailering performance. We ditched the 2022 Trail Boss (7500 miles) for a 2022 LTZ with all the bells and whistles. Empty, the Trail Boss consistently averaged 26-27 mpg on our trips to Vegas from Pahrump (120 mile round trip) which you climb to 5500' asl on Hwy-160 Spring Mountain. Trips to Mesquite, NV 135 miles we'd averaged 29.8 mpg on the LTZ which is about 1-mpg better with the lower front air-dam and 2" lower stance. Trailering with a 22' GeoPro at 3800 lbs on the scales and traveling at 60-65 mph, fuel economy has ranged from 12.2 to 15.5 mpg depending on head winds. Everywhere we travel in NV and AZ there are mountains and the 3.0l does as good as our 6.2l in our 2014 Silverado High Country. Granted our 2021 Silverado 2500HD with 6.6l really had the torque to haul a hard wall camper and tow our 2018 Colorado ZR2 behind it for off road use. Economy on the 2500HD ranged from 18.5 mpg empty, 13.5 mpg with camper and 12-14 mpg towing the Colorado ZR2. We are very pleased with the 3.0 Duramax with it's 420 lb. ft of torque and turbo for mountain elevation and exhaust brake performance. We do a lot of off the grid camping and the 4x4 Z71 package gets us in and out with no problems towing.