Rated to tow up to 13,450 pounds, the 2500 HD made neat work of hauling an 8,500-pound camper. It took off from stops with no strain and accelerated into the passing lane with more control and confidence than I could get with a gas truck — and I ought to know, since I tow a comparably heavy boat with a gas pickup. The Ram showed 10 mpg towing at 55 mph; my late-model V-8 gas truck gets about 8 mpg. When not towing, the Ram’s standard digital display showed an average 17 mpg at 50 mph on a twisty back road, and 22 mpg at 70 mph on the highway. My truck, and similar full-size gas pickups in published reports, are some 20 percent less efficient.