you must drive slow, I have never seen that kind of mileage out of most of the dodges cummins trucks I owned. only one that would do that was a single cab 2wd 93 mechanical injected dodge. my '02 and '06 which didn't have near the emissions controls wouldn't get anywhere near 19 nor will my dad's early '04. yeah if I drove the trucks at a constant 60 mph I bet I could do that. but the 75-80mph speeds normally left me at about 15mpg, a little more for the 04 and 02 a little less for the 06. BTW i hope you handcalculated that mileage because my 06 in particular was about 5mpg high on the trip computer.
