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Topography. Or, as both Cummins and Kenworth note, follow truck spec as next in order for FE. They call it, terrain.
Thought of you when I recently made the mistake of running a 79000-lb truck between two PA Interstates on a state highway. Note to self: never again. That was on a run to near Hamburg out of IL. Terrain only begins to cover a narrow 8-percenter. Sure made my day longer.
Yes, if you ever did version two or three, the aero benefit would be obvious on the long flat land runs.
I see you're over by one of the nations best CB shops. DTB Radio. Ground (bond) that lid and bed correctly and you'd improve a roof mount antenna like the low key Larsen NMO27 perceptibly.
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