Here is a VERY interesting model -- it is apparently an earlier concept of the Mercedes Bionic "Boxfish" car:
It has a Cd of
0.095, which is amazing!
Mercedes-Benz Bionic Car
And, I have never seen this "Antro Duo" before:
Antro
The Solo (which has 3 seats, the Duo seats 6) weighs just 270kg / 596 pounds!