The VW 1L and Daihatsu UFE III are both in the .15-.16 range.
MIT Solar Car: 0.11Cd.
0.11Cd means the MIT Solar Car can do 90 - News - PlanetTesla
Sometimes you find very low Cd reported for aircraft and fish, but they're not comparable to automotive Cd, since they use wetted area rather than frontal area for the calculation.