I've lurked here for years, and in the last six months there have been so many great samurai related threads I just had to jump on.
I swapped a dirtbike for my samurai and I am thinking of building an aerodynamic fiberglass top, that would extend back a maybe 20 inches or so from the back face of the tailgate. Give a little more room and hopefully improve mpg's even further. My goal is to sleep inside and be able to haul me, the missus, and the two big dogs, plus backpacking gear. Mine got 33mpg on a recent 300mile trip with 4 2000ft mountains to go over. Only mods I've done are k&n intake I literally got out of a dumpster new in box, and 235/75 r15 mud tires.