8. Mazda Parkway Rotary 26
The Mazda Parkway Rotary 26 holds the distinction of being the world’s only rotary-powered bus, launched in 1974. With its smooth-running engine, the Parkway stood as a bold demonstration of Mazda’s willingness to defy convention—even in commercial vehicles. While it proved impractical for everyday transit due to fuel economy, its existence highlights Mazda’s relentless pursuit of engineering novelty. It’s a fascinating chapter in the brand’s rotary legacy that few outside Japan remember.