Just pulled back into home after 52 days on the road covering 7838 miles through 18 states pulling a 40 foot fifth wheel coach with a 15500 lb GVWR. My tow vehicle is a 2018 RAM 3500 Dually 4 wheel drive 6.7 Cummins mated with a 68RFE transmission and 3.73 rear end.

Oh, I have a DRD EGR compliant tune with plus 30/60/90/120 hp on the fly capability.

Overall fuel mileage to include towing and in-and-around driving for sight seeing etc. was 12.2 mpg. All towing was done on the plus 30HP setting and using OD (6th gear) locked out most of the time unless pulling really long 6 percent plus grades.

Had the MM3 monitor set to monitor RPM, Boost, Transmission Fluid Temp, Engine Coolant Temp, and Torque Converter Slippage. I could not be happier with how the RAM performed! Even on 95 degree days pulling long grades at 7000 ft above sea level in the Rockies, the engine coolant temps never exceeded 215 degrees which was for very short periods of time and the transmission fluid temps never exceeded 176 degrees even in 3rd, 4th, or 5th locked out on the long 6%+ grades.

Very rarely did I have to drop out of OD (6th gear) except as mentioned on some very long steep grades in the mountains. The engine brake worked like a charm, saved the brakes a bunch on down grades. Even worked great on Pikes Peak (wasn’t pulling the coach for sure) but it did climb Pikes Peak two days before the Hill Climb Rally this year so I guess we beat those guys to the top.

I would highly recommend anyone thinking about getting a tune but not wanting to delete just yet get the DRD EGR Compliant tune. It worked GREAT!

Thanks for letting me use this forum to comment/brag about the RAM with its 6.7L Cummins!