9. Ford Sierra (1982)
The Ford Sierra, introduced in 1982, featured a rounded, aerodynamic ‘jellymould’ design that marked a significant departure from the boxy sedans of its time. This innovative styling achieved a drag coefficient of 0.34, enhancing fuel efficiency and performance. While its unconventional appearance was initially polarizing, the Sierra’s design influenced the shift towards sleeker profiles in the automotive industry, paving the way for modern aerodynamic vehicles. (The Guardian)