I did an aero study on the Honda Jazz/Fit two-box body shape design. I added an annular spoiler or 'duct' wing instead of the typical boat tail shapes on eco-modded vehicles. The theory that a complete rear 'ring wing' would extend the encompassing flow to a controlled tapered & longer terminal edges. I conceded the flow break from the body shape to a clean front edge of the 'duct' wing. So many wing manufacturers could just create a complete ring for an cleaner aero taper? Just saying...
