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Another update...
I am a bit confused by the performance of the horizontal bed seal, it showed a benefit at lower speeds but then ultimately created more drag & downforce on the bed. Truck was very stable at 60~70 mph with vs without. With that though came added drag. I ran a full tank with an eco milkman mentality behind the wheel and mpg's were still in the low 23's. I ended up pulling that seal, watched that stability go away and can feel drag being reduced... (truck feels "lighter").
I explored and tested several things in the back bumper but ultimately, open and left alone was king. anything I did back there just caused drag and that heavy feeling that goes with it. I have concluded that the bumper bracket could be opened up to relieve air pressure back there, how much that will help will remain to be seen.
To date I have 9~10 (would have to go back and look at receipts) tanks over 23. Pretty happy about that given that its a 4wd truck, and a heavy one at that (7k#).
I want to make a front wheel air curtain by pulling air from the front bumper insert and routing it to the wheel well, not sure if that is feasible or not, need to look behind the bumper and determine a route to the fender.
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