The 6.0L is a very reliable, been refined over the years and has proven to be a solid winner. I’m sure some people have had problems with them, but for the most part the engine just works. Definitely not a winner in the mileage department, but what big block is?  

Yes, definitely the loser for mileage. mine is ok if I’m not towing, it’s when I’m hauling around 5-6ton is when it starts to get a little thirsty.       

That’s a diesel - talking about gassers in the HD series and their wonderful fuel mileage.  I’m not complaining, just the way it is. 

Getting 20-21mpg hwy with my 2022 Ram 2500 Cummins MegaCab. 30,000kms on the ODO. 

Ya, my 6.4 in the dodge ain’t winning no fuel mileage competitions, but what is in a 3/4 ton truck.  It’s pretty crazy the difference between a 1/2 truck and a HD truck.