just finished a 2588 mile trip pulling about 12000 lbs. (5th wheel)DW kept track and here is the low 9.4 and high 11.9-2013 Dodge 3500 4x4 with 6 speed stick-truck did a very good job-I was impressed!...
truck is a dually with 3.73 gears-9.4 was strong headwinds and 11.9 no wind-from pa to az mostly on I-81 and I-40-truck did a good job-could run as fast as I wanted to-had to watch myself ha-ha!-whsk