Mind my possible oversimplification here but, if we're talking about completely autonomous driving, why not simply have all passengers recline (to the point of alomst completely riding lying down)? The entire car could be only a couple of feet high, making the height and likely frontal area some half of even the most aggressively low-slung sports cars. You could also make the whole thing shaped like a triangle, putting one passenger between a moderately behind the left-right passengers and one slightly in front (you could even have them all facing each other). If I have it right, this would hopefully allow for a very easily elongated and inward/tapered tail, an outward "tapered front" (shaped not unlike a flattened/shortened front-top and rear-top of a jet airliner) and insanely low Cda.
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