By the way: the idea of taking a vehicle like the Prius, with an already "better than average" Cd, and modifying it to make it even
more aerodynamically efficient isn't unprecedented.
GM did the same thing with its Cd 0.19 Impact/EV1 for a record speed run:
(
source)
Note the ...
- extended boat tail,
- lowered ride height,
- smooth wheel discs,
- rear wheel skirts (stock on the production EV1)
- full grille block (the EV1 ultimately had no grille, but some versions of the Impact prototype had stylistic openings, as well as openings for electronics cooling)
- external mirror delete,
- improved deflectors ahead of the front tires,
- ... and lots and LOTS of speed tape!