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!...
Chris- My only experience with the new truck was a 2,000 mile trip to CO and NM last June. Part was mountains and almost every day was high winds. That plus the fact I generally ran at/near 70 on the interstates likely dropped the mileage quite a bit. Would probably be considerably better at 60 on flat highways and no wind. I just have a problem keeping below 65. :S