[brucepick]

Like an idea I built once, I think the reverse tailgate is d**n clever but not of much benefit, and there's a good chance that thing sticking downwards will hurt the overall aero. The dropped tailgate apparently only works on SOME pickups. But I think that where it does work, it's partially due to the pretty bad aero properties of pickups in general. So even a small improvement is welcome.

I'd say, work to build as much of a true aerocap or Kamm treatment as you can. Just go for the teardrop outline. Every half foot or foot of length (with appropriate taper) will give you additional gains. If you can only build it back 2-3 feet from the cab, fine, it will be better than no cap. That's my guess.

I finally ditched the clever rear spoiler thing I worked up, and instead built a simple Kamm type extended roof line for my Civic. Much simpler and apparently much improved aero.