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I believe I read in Hucho's Automobile Aerodynamics book that someone tried ducting high pressure air from the front to the low pressure area in the rear. The overall message was that it was a lot of effort to construct such a complex duct for what amounted to a negligable/non-existant gain.
Keeping the vents open, but the fan off, will probably net you a small fraction of a percent in drag reduction. I'd be hesitant about opening the windows any, but the usual cabin air exit is under the trunk fascia behind the rear wheels. You could probably modify that duct in some way to speed up flow rates.
I bet the Aptera wake fill device is more a publicity statement expressing "aerodynamic perfection" than it serves in reducing drag. It is probably effective as a wake fill device since the Aptera's wake is so small to begin with. For that same exact reason, it is probably negligable since that small wake contributes so little to drag.
- LostCause
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