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BMW's Vision EfficientDynamics concept bound for Frankfurt

BMW has revealed a radical vision for its future performance-oriented models in a spectacularly styled concept car whose combination of M3-rivaling acceleration and Mini Cooper-beating fuel economy will likely make it one of the stars of this year's Frankfurt motor show. Called Vision EfficientDynamics, the one-off coupe is a mobile showcase for lightweight construction and plug-in hybrid drive technology, while featuring a variety of futuristic styling, packaging, aerodynamic, lighting and interior ideas under development at the German carmaker's heavily cloaked FIZ development center in Munich. Many of the concepts are planned for use on upcoming BMW road cars, including an exciting Z10 EfficientDynamics range-topping model due by 2015.

Hood-ornament quiz--the answers

Were you able to separate the Cadillac from the Packard in our hood-ornaments challenge in the April 5 issue of AutoWeek? We wanted to know whether you could identify eight classic cars solely by their hood ornaments. Here's the place to confirm your car-knowledge prowess, or to recalibrate your hood-ornament history.

Mercedes-Benz SLS AMG: The gullwing takes flight

Before we reveal what it is like to hot-lap a prototype version of Mercedes-Benz's 6.2-liter V8-powered SLS around the 2.2-mile Sachsenring in eastern Germany, let us tell you one thing that puts the big rear-wheel-drive coupe into clear perspective. The SLS, planned to get its first public outing at the Frankfurt motor show in September, is not based on any existing Mercedes model. Rather, it has been conceived, designed and engineered from the ground up in a no-compromise approach by the German carmaker's in-house tuning division, AMG.