What mileage does a 96 Dodge 2500 Cummins get while hauling a heavy load?

My 96 dodge pick up usually gets 21-23mpg, with out pulling any thing. Any one know what it gets while pulling heavy loads?|||if its running right you,ll average about 12-14 maybe more with it,we use one to go to the car sale with and it gets about 14 hauling two cars,and that's running about 65 miles an hour with it,but it never drops below that,and that's a constant mileage also,our trailer is little heavier then most though,for us its cheaper to bring them back than to pay to have them brought back,good luck.|||All depends on how heavy your talking. My 97 gets 12 to 13 pulling 22,000lbs at 55 to 60 mph. And anywhere between 18 and 22 with no load.|||Gas mileage all depends on terrain and how fast you are going. Do you do a lot of stop and go driving? Or is it mostly highway? And depending on how heavy the load is that you are towing. Say you are towing a 2 horse trailer. So say you have 2, 1000 lb horses on a 3000 lb horse trailer. Towing 5,000 lbs and traveling at 60-65 mph, i would suspect your gas mileage would drop to about 13-15 mpg highway. Not reving any more that 2,200 RPM. But like i said, gas mileage has many factors. Maintenance, how heavy your foot is, the terrain, they type of tire you have on the vehicle, how much air you have in your tires, etc. I believe the stock tire size on your truck is a LT 245/75R 16, E rated or 10 ply. A highway terrain tire or HT is what i would recommend especially because it is a diesel and diesels do not work well with All-terrain (AT) tires. If you have stock tires with the manufactures recommended tire pressure which is 65 PSI in the front and 80 PSI in the back. 80 PSI in the back when you are towing, 65 in the back when you are not towing, it will give you a better ride quality. I dont see why you wouldnt get any less than 14 MPG when towing approx. 5000 pounds. I hope I answered your question.|||Stock motor with turbo about 14 but that is a lot of weight for a 3/4 ton. Manual says max weight is 14000 lbs a dually would be a lot safer and a lot easier on you and the truck less sway on the trailer and less wear on the truck. The truck will haul it but it won't be easy