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The smaller the Cd the lesser the power loss. The power loss induced by aerodynamic drag increases at a cubic rate of the velocity variable:
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ReferenceReferences:
https://www.ijert.org/research/aerodynamic-development-of-a-solar-car-IJERTV4IS060435.pdf
Design report/ Analysis study of Solar Cars:
Sunswift eVe - https://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1146&context=aero_fac
Honda '96 Dream - http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.461.3467&rep=rep1&type=pdf