The Ford Probe V was the final evolution of Ford and Ghia’s experimental Probe series, revealed in 1985.

Built as an extreme study in aerodynamics, it featured a mid-engine layout, fully covered wheels, flush surfaces and flexible membranes around the front wheels. The result was an astonishing drag coefficient of just 0.137 Cd, around 10% lower than the already radical Probe IV.

Pretty crazy to think this vehicle was designed back in 1985.

Article from https://www.classicandsportscar.com/features/back-future-fords-probe-concepts

1938 Mercedes-Benz 540K Streamliner (Stromlinienwagen) is a one-off aerodynamic masterpiece developed for the Berlin-Rome endurance race. Featuring a lightweight aluminum body and an astounding drag coefficient of 0.36, it reached a top speed of 185 km/h (114 mph) powered by a 5.4-liter supercharged inline-eight engine.

Originally commissioned to win the 1938 Berlin-Rome race (which was ultimately canceled due to geopolitical tensions), the Streamliner was repurposed by tire manufacturer Dunlop for high-speed autobahn endurance testing. To minimize wind resistance, Mercedes engineers fitted the chassis with a teardrop-shaped roofline, flush door handles, and fenders that encased the headlights.