I designed a tandem 2 seater electric car with 3 wheels, that I was playing with. I may build it one day when I have less important things to spend my money on, building a house atm, from scratch, just my wife and me. It actually ended up looking a lot the Elio, but a bit bigger and a little wider. Mine also had the front steering components completely enclosed and it tapered back (like the one in post #1) with a teardrop shape viewed from the top. Back when I had access to the Project Falcon 3D wind tunnel software I ran my model through and
if I remember correctly it managed 0.10Cd and pretty much neutral as far as uplift and down force, but then again that's only virtual. Everything changed once it actually comes to the real world. All my math on it said it would have been 300+ mpg with about 120 mile range and top speed of 65mph. Ahhh, one of these days.
Pic of Elio:
