Fiat Turbina may have a lower drag coefficient, but the Chery (Cherovlet, China?) doesn’t look like it wants to tongue kiss you.
All of these, including the Chery, were concept cars. I remember the Ford Probe that actually made it to market had a very good rating. It never took off, and you don’t see them any more.
Somebody got their Chery popped...
I believe the AMC Pacer was the most aerodynamic car ever made...
Wikipedia: Fiat Turbina
Looks like something from the Speed Racer cartoon.
With that front end it appears to have more coefficient drag than 1953 Studebaker commander.
Aerodynamics isn’t that big a deal. At normal highway speeds, good vs bad aerodynamics might give you ±2-3 mpg. Stacking a bunch of bikes on your roof (terrible!) and hitting 100 mph, you might half your mileage. But most vehicles (even older ones) have enough of a decent aerodynamic design that all you can really do is make small improvements that aren’t that noticeable. Underinflated tires is going to do more damage to your numbers.
And really, would you rather have a badass looking Mustang or Corvette from the 60s (obviously with today’s improved engines and all), or the sleek-ish all-look-alike ones from today? Can a non-car guy even tell the difference between the Camaro or the Charger or the Challenger or even the Mustang?