As I see it, the rear entry is actually one of your most expensive features in terms of aerodynamic drag.
Adding one side door and switching to three rows of side-by-side seating would allow you to slice a foot out of the middle of the car - absolutely huge from a frontal area perspective (six square feet!), and from a Cd perspective as well.
And again, there's no need to allow the batteries to contribute to the frontal area. I see room to remove a few square feet of frontal area there.
It looks to me like these two basic changes could cut your aerodynamic drag by about a third! Don't you agree?
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