2. Volkswagen XL1
The Volkswagen XL1 is perhaps the most futuristic car VW has ever produced. Designed as an ultra-efficient diesel plug-in hybrid, the XL1 achieved mind-blowing fuel economy thanks to its lightweight carbon fiber body and aerodynamic design. With scissor doors and a silhouette that looks more spaceship than street car, it turned heads wherever it went. Only a handful were built, making it an exclusive showcase of Volkswagen’s technological prowess and environmental ambition.