Originally Posted by mstan
I just purchased the 2012 Longhorn 3500 dually with 373 gears. Beautiful Truck with very roomy cabin. For me the Dodge is a love hate realationship thus far. Fuel mpg is in the pits. Dodge does not put as much metal in the bodies as Ford. Dodge intergrated brake is not as good as the Ford. Dodge auto tansmission in my opinion will not come close to the Ford or Chevy. I do not trust the Transmission. The Tow haul just simply doesn't work as smooth as the Ford. The Dodge Automatic transmiison has to be manually shifted for best results.
Our mileage towing a 16,000 GVWR, 13'2" tall, 102" wide 5th wheel is 9.5 to 10 MPG at 62-65 MPH on the Interstate - with 4.10 gears. I don't know how many miles are on your truck, but the Cummins will improve on fuel mileage as the miles accumulate.
Have you set up your ITBC through the EVIC system setup screen for the appropriate selection regarding type of trailer brakes and trailer weight? The options are electric light, electric heavy, electric over hydraulic light and electric over hydraulic heavy. Once set up for your trailer, the ITBC in the 2012s seems to work OK from the reports on TurboDiesel Register and other Cummins/Dodge forums.
I've never heard anyone complain about the 68RFE. Ours works fine in tow/haul and integrates the exhaust brake with the transmission shift schedule to provide excellent results. Frankly, I just hitch up, turn on tow/haul, the exhaust brake and let the computers do all the work. The consensus on TDR among those of us who tow with the 68RFE is that it is working out fine. It's been in service since the first 6.7 Cummins engines came to market on January 1, 2007, so it has a good service history on which to base these observations.
Based on our experience, I'd highly recommend the Dodge/Cummins for consideration for anyone looking for a tow vehicle.