maybe a lip spoiler at the end of the cabin would help. a lot of hatchbacks and breaks have this. perhaps even a small kammback that attatches to the roofline and sides, and slighthly angles inward. it wouldn't compromise the looks or usefullness of the truckbed much but might do a lot for aero if done right.
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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