[Frank Lee]

I think a convincing case could be made for cowmeat's Peel entry to be the most aerodynamic street legal vehicle in the entire thread.

It's not all about Cd; it's about CdA and there's little (PUN!) doubt the Peel has the smallest frontal area. So we'd need to know the CdA before writing that one off.

And it has no front grille and nice radiussed leading edges, although the suspension looks dirty. And consider the highest aero HP requirement it'll ever have, due to it's modest cruise speed.

The trikes might have decent aero too, with their nice front ends and sort-of Kamm tails.

That HSR II looks like Mitsu's answer to the Oldsmobile Aerotech to me; more trick racecar than street vehicle.