What is the fuel mileage for Dodge Cummins trucks from 2003 or newer?

I am getting 16 city 22 hwy in a 2007 2500 4WD. They hwy mileage is at 65 any higher the mileage drops off.

I have an '03 with 35" tires and 8" of lift with an Edge chip with straight pipes and I get 16mpg in town and 25 to 28 mpg on the highway.

i'll assume your hauling/hot shotting if this is your daily driver all i can say is why??? but any way if your hauling your blowing most of your fuel in the form of black smoke out your exhaust getting up to speed or climbing steep grades. for about $1000 bucks you throw a propane kit on it you can refill the at any propane station rv parks and alot of truck stops . from a dead stop till you hit cruising speed just lay on it / the same as well for steep grades. I was hot shotting for a steel company as a second job when diesel was $4.50 a gallon and we put one on my bosses truck my mileage was equal to running without a load when i used propane to accelerate and speed control up hills.

The fuel mileage would be 13mpg city and 16 mpg highway.