[aerohead]

I ran the dimensional analysis using the estimated values Vekke posted.
For the robo-taxi's fineness ratio and effective fineness ratio, 'outlier' empirical Cds within the same constraints have been reported as low as 0.175.
Also, we know from Mercedes-Benz that, as Cd approaches this drag threshold, that road load is diminished to such a reduced value, such that all heat flux from battery, motor, and power-electronics is so low, as to be successfully rejected from an aerodynamically passive 'cooling plate', rather than a 'porous' radiator heat exchange medium, which itself, 'compounds' drag reduction.