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At GM, the tail fin is back--but now it's a blade

Tail fins are making a comeback at General Motors Co., although they are a far cry from the saillike appendages of the 1950s. And this time the company is calling them blades. The look, pioneered on the Chevrolet Volt to improve aerodynamics, will appear on other models to boost fuel economy, said Ed Welburn, GM's global design chief.

V6-only Ford F-150 Limited gets more luxury and utility

The big news for the Limited trim option of the 2013 Ford F-150 is that it will be powered exclusively by the company's EcoBoost V6, making 365 hp while returning a claimed 22 mpg on the highway in two-wheel drive trim. The new F-150 Limited gets 22-inch polished aluminum wheels, body-color front and rear bumpers and standard HID headlights. The Limited comes only in SuperCrew configuration, and only in three colors—red, black and white.

Tesla teases Model S prior to debut

Prior to its world debut on March 26, Tesla has decided to whet the appetites of green-car fans by releasing a teaser image of its upcoming Model S sedan. Under the direction of former Mazda designer Franz von Holzhausen, the Model S features a rounded front nose, a front fender plate with an affixed Tesla emblem and a noticeably shorter hoodline. Unlike the Fisker Karma, the Model S will be powered solely on battery propulsion and do without a range-extending engine, which helps accommodate the shorter hood.