My 07.5 SRW 3500 Cummins with 4.10s gets around 18 towing and 23-24 unloaded. Deleted and tuned, auto and 4.10s. I haven't had any costly repairs to date with 225k on it. Knock on wood lol
I had a 2010 Chevy 2500HD with the 6.0 before this and it was decent but sucked the fuel. Really had to...