Judging a car involves many metrics. For consumers, it's about efficiency, cost, and practicality. For enthusiasts, it's about performance and speed. However, one critical factor relevant to almost everyone is aerodynamics.
Good aerodynamics mean better fuel efficiency for daily drivers and higher stability for performance cars. This is measured by the drag coefficient (Cd), where a lower number is better. While most modern cars are aerodynamically efficient, some iconic models are notoriously poor.
The Tesla Cybertruck, despite a flat underbody and sliding bed cover, has a Cd of 0.38. The 2019 Land Rover Defender's boxy, retro shape results in a Cd of 0.39. The Volkswagen Beetle RSi, with its rounded form, scores 0.40.
Classic sports cars also feature. The Porsche 911 SC (1978-1983) has a Cd of 0.40. The legendary Lamborghini Countach, a wedge-shaped supercar, prioritizes style over airflow with a Cd of 0.42.
The original Volkswagen Beetle, designed for affordability, has a nearly upright windshield and a Cd of 0.48. Large SUVs fare worse. The Hummer H2, a massive, boxy vehicle, achieves a Cd of 0.52. The Mercedes-Benz W463 G-Wagen, another upright luxury off-roader, scores 0.54.
Performance extremes are also penalized. The track-focused Dodge Viper ACR Extreme, with huge wings and splitters, has a Cd of 0.54. The 5th-gen Ford Bronco, despite a sleeker look, has a Cd of 0.60.
At the bottom are minimalist and historic cars. The 1993 Caterham Super Seven, with an open-wheel design, has a Cd of 0.62. Finally, the Ford Model T, the grandfather of the auto industry, suffers from exposed components and a Cd of 0.79.