10. XL1 (2013): Carbon Fiber Body for the Masses

With the Volkswagen XL1, VW introduced carbon fiber reinforced polymer construction to a production car aimed at everyday drivers—a milestone few other automakers, including Mercedes, had achieved at the time.
This lightweight body enabled astonishing efficiency and futuristic design, making the XL1 one of the most advanced eco-cars of its era.
Volkswagen’s bold use of exotic materials brought supercar technology down to a practical, road-going level.
Source