Handles load good, cruising along on flat rpm under 2k, first down shift 2300 next down around 3000. Shifts are smooth. That is in tow mode. Never drove a diesel much, but what I have this will get there quicker.but I don't pull 30000 gvw loads. Most of my miles are pulling something. Even if it's a 4 wheeler trailer.
I have a 2020 Silverado 3500 with 6.6 gas. Empty I get 19 to 20 MPG. I drive 65 to 75 mph. I've pulled several loads of lambs grossing over 26000 lbs. Get 7.9 loaded and around 9.5 to 10 with empty trailer. I run E-25 when I can get it, about half the time. The thing on the dash says best mileage is 26.6. I have about 18k on it.