Extreme sports star Travis Pastrana is throwing in the towel on his NASCAR career, announcing that he'll not be taking part in the 2014 Nationwide Series. Pastrana, 30, ran his first NASCAR event in 2011, the Toyota All-Star Showdown, and made his Nationwide Series debut in April 2012.

A diagnosis of any degenerative autoimmune disease can be devastating, but after recently learning he had developed multiple sclerosis, NASCAR driver Trevor Bayne is shrugging it off and says he'll continue to race full time for Roush Fenway Racing in the Nationwide Series this year. Doctors and NASCAR have cleared him to compete behind the wheel.

Growing up as both a dirtbike and video game enthusiast, I always found it odd that Nintendo's Excitebike featured straight-line supercross riding. Proving that some ideas are better executed in real life, Red Bull has created its own take on this video game's racing style with the Straight Rhythym supercross track.

Ring one up for Mazda. The Japanese brand's midsize offering, the Mazda6, has been named Popular Mechanics' Car of the Year. The 6 received a comprehensive reworking for the 2014 model year that saw it adopt sleek, sexy sheet metal; a clean, logical interior; and

If the development of the Bugatti Veyron represented the greatest gift the Volkswagen Group could have given from its deep R&D pockets to performance enthusiasts, surely the XL1 does the same for tree-huggers. It represents no less significant an investment on VW's part, and no less significant and advancement in term

Some look at the emergence of a new Porsche 911 and see a car. But to Porsche engineers, it might as well be a reset button. Because every time a new 911 comes out, it sets off a tidal wave of new variants to follow, including convertibles, turbos, targas, GT3s... the works.

With just two months to go before the official debut at the Detroit Auto Show, Hyundai is putting together some beauty shots of the 2015 Genesis Sedan in action. Fortunately, our spy shooters were on hand, as well, and the result is our best look yet at the all-new sedan from every angle sans camouflage.

Toyota released images today of a concept car powered by hydrogen fuel cells. The electric FCV Concept will be unveiled later this month at the Tokyo Motor Show.

With freshly redesigned 2014 Silverado 1500 and 2015 Silverado HD trucks, Chevrolet will continue its pickup offensive by unveiling the next-gen Colorado at the LA Auto Sho

For the last few years, Audi has been publicly toying with building a successor to its Ur-Quattro, a model still glowing in a gritty patina of motorsports glory decades after it left the scene. If anything, the rally car's halo has burned brighter as Audi has matured into a world luxury superpower. Since 2010, the German automaker has shown Chris Paukert