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General Motors fires back at Volkswagen

General Motors issued a terse response this week to published comments by Volkswagen CEO Martin Winterkorn, who suggested to the German press that Opel could be sold to a Chinese competitor. Detroit-based GM called Winterkorn's comments “regrettable” and accused him of “fanning speculation.” Opel was nearly sold to Magna and Russian investors in the wake of GM's 2009 bankruptcy. But then-CEO Ed Whitacre and the corporate board reversed that decision, igniting controversy from German political and labor leaders who have long chafed under American oversight.

Audi Sport Quattro concept hits ahead of Frankfurt motor show

Audi is set to take next week's Frankfurt auto show by storm. It is unveiling the new 700-hp Sport Quattro concept -- a car promising to be a new technological flagship for Audi, and one that company insiders strongly hint will go into limited production. The concept is being created to celebrate the classic Sport Quattro's 30th anniversary.

Tesla presents the $0.06 quarter-mile run

How much fun can you have for six cents? Depends on how much fun you consider crushing a Dodge Viper on the quarter-mile in a Tesla Model S. We showed you a video of that feat a while ago.