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Welcome !
The diesel manual would help a lot. My last 2 tanks without the trailer have been 19 MPG.
The fairing in the above and the kammback are good ideas. Switching to a longer but very square back trailer (toy hauler) actually increased my FE from a smaller rounded trailer. I put that to better flow seperation in the rear.
I had a deflector on a prior rig that helps, but don't stand it up too much. I think one that goes closer to the trailer as above would really help.
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