2014 RAM Diesel 1500

Folks,

If I understand what the folks who own diesel trucks, there is very little gas millage change from loaded to empty...

According to Motor Trend, the real world millage for this truck is 26 mp (us) g. Does this means that if I was hauling a 7K pound tag along trailer, I would achieve over
20 mp (us) g ?

Thanks
Ian

my diesel power mag did a tow test of the truck you are asking about and got 28 mpg unloaded and 19 towing 7600 pounds.