I have a 2015, Oct 2014 build date, 2wd, 6.4 Crew Cab, Big Horn. Bone stock except for lighting upgrades. I live in the Southland, don’t play in mud, no need for 4wd. With my 3.73 gear I easily get 20 mpg highway. I must stay under 70 mph to get that number. (No, I don’t drone along at the speed...