I just came across this article that compares the aerodynamics of the Tesla model S, Nissan Leaf, Toyota Prius, Chevy Volt, Mercedes CLA 250 and a 2001 Honda Insight for Hybrid.
http://www.greencarreports.com/news/1092373_aerodynamic-tesla-model-s-electric-car-wins-the-wind-tunnel-wars
The...