Change tires to a smoother road tread, something that you can put higher pressure into. If you increase the tire circumference you effectively do the same thing as a rear end reduction (except that most larger tires weigh more). Pull the mirrors in when you know you will be on the highway. Partial grill cover perhaps. Remove any aero-no-nos like cab shades and bug deflectors. If you have construction skills I would say build a 3 foot folding partial fishtail (top teardrop) attached to your cab roof and covering your bed partially when you can. It could fold down against the back window, or perhaps fold up over a load. You could also build partial side shouds but I am not sure if any of this would make much difference...be fun to experiment though.
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