I think all these questions point to designing more of an effective "Kamm" style tail, than a full boattail, for a real world commuter vehicle. Though I think the AeroCivic was well designed and has effectively proven the point that it can be done, my ideas run more toward a "Kammtail" extension, a little longer than the one on the MetroMPG Firefly, giving the vehicle more usable cargo capacity, and beyond that, a collapsible, perhaps inflatable, extension for longer trips, when it would be more effective for long range mpg gains, and less of a pain in the boattail to deal with.
But alas, I'm just theorizing while awaiting videos and test results.
Quit teasing and get on with it.
