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Audi lightly updates 2011 TT, adds power boost

Audi's nifty two-door TT gets a light update for 2011, with a bit more power under hood and some minor modifications inside and out. The spotlight change is to the engine. The 2.0-liter TFSI is bolstered to 211 hp and 258 lb-ft of torque thanks to Audi's valvelift system, which also improves efficiency.

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.

NHTSA may investigate Grand Cherokees over fuel-tank fire hazard

The Jeep Grand Cherokee from the 1993 to 2004 model years may be investigated by federal safety regulators after a complaint that its fuel tank is an exposed fire hazard that may have contributed to hundreds of deaths. Last month the nonprofit Center for Auto Safety complained that the SUV's fuel tank extends below the rear bumper and is inadequately protected from crashes and rollovers. The vehicle's fuel filler neck also tears off in crashes, said the center's petition for an investigation and recall.