Cummins vs Hummer Towing 6,000 lbs

Fisherman wrote:
That's almost not believable from the Cummins. I had an '04 towing a 5k trailer and never got less that 18mpg. Something wrong with that engine.

I think you're figuring Canadian gallons or something. I get about 14 mpg towing, whether its a 3K enclosed trailer or a 10K dump trailer with my 7.3 diesel F250. I expect your truck would do about the same. I'd also expect that a pre-emissions motor should do better mileage wise than a new one, although our older trucks don't have nearly the power.