Tall and narrow is how they fit three people within a smaller footprint than a SMART ForTwo. Granted, they could get more aerodynamic with a longer design with a proper tail, but the whole point is to give it the smallest footprint both in terms of wind resistance and road usage, while giving it usable interior space.
Granted, it's possible to design something more fuel efficient and more aerodynamic, but difficult while meeting the same safety and space targets.
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