The truck usually turns about 1700 rpms at 70 mph. In "tow/haul" at 65 mph it was turning 2200 rpms. This was with a 14,000 lb. gooseneck trailer. The only time it downshifted was on a couple of hills and a steep overpass and if I passed someone. It was a 70 mile trip on flat to hilly terrain west of Dallas.
