Nearly 30 years after Fiat sold its last car in the U.S., the 2012 Fiat 500 officially makes its debut at the Los Angeles auto show. Cute as a button—or at least a New Beetle or Mini Cooper—the 500 will be powered by a 101-hp, 1.4-liter four-cylinder with 97 lb-ft of torque when it goes on sale in January. The little four-cylinder is assembled in Dundee, Michigan, and utilizes variable valve