This is my explanation. Yes 55-60mph is the sweet spot, and yes it really makes everybody mad around me, but I'm ok with it.
2014 RAM 1500 ECODIESEL 3.0L VMMOTORI REAL TOWING MILEAGE - YouTube
2014 RAM 1500 ECODIESEL 3.0L VMMOTORI REAL TOWING MILEAGE - YouTube