Just bought a Dodge Ram 2500 Diesel 6.7 and I'm confused

I have a '14 Ram 3500 Mega Dually Aisin w/3.73's. In town or when speeds are less than 45, I use T/H and EB on Full. Slows it right down and keeps shifting to a min. When above 45 (constant) I turn off T/H (not towing) and EB on auto. This gives me the best performance in town with engine braking, and best mileage on the hi-way. It was just a matter of trial and error. Towing a decent amount of weight, T/H would probably be on full time. Steep down grades towing EB would probably go to Full. Just my .02