i recentyl came accross this article about the pinafarina aero car experiment with an 0.201 Cd it wouldn't look even half as unconventional today as it did back than.
Popular Science - Google Boeken
also it just seems to get the basics right, and without compromising practvality or intyroducing shapes that would be difficult to make.
if you start with the best possible shape and that make a few compromises to turn it into a car you'll always end up with something better than when you make a car and than compromise the styling to get it a bit aero