Prius now? Here's an MX-3 ...from Ecomodder in 2008.
http://ecomodder.com/forum/showthread.php/mass-produced-car-closest-teardrop-shape-5924.html#post71608
I'm not clear on the high-tailed approach
vs the 1930s tail-dragger approach. It seems like the high tail would be shedding vortexes off it's lower edge.