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Well, 15-20 kW in another EV would translate to 6-8 kW for the Aptera. Full solar at 700 W would translate into a 10% range increase in optimum conditions.
Efficient aerodynamics helps most at high speeds because that’s where the aerodynamic drag is the dominating force. The aerodynamic drag probably decrease just as much at low speeds, but at low speed, other forces are a larger part of the total, so aerodynamic drag is less of an issue.
I wouldn’t be surprised if someone light footed and good at hypermiling would get 1000 miles of range out of a 400 mile variant, even without solar.