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The scramble for scarce tires

North American automakers are struggling with a nagging shortage of tires, caused in part by tire plant closings and rising demand for low-volume specialty tires. Automakers are paying much higher prices -- double-digit percentage increases from a year ago -- as tire makers gain pricing power. "We have been bombarded from every side for additional tires, and we can't keep up," said David O'Donnell, Continental Tire's vice president of original equipment in the Americas.

Bugatti Veyron 16.4 Super Sport hits 268 mph

Bugatti is claiming a new production-car top-speed record with a combined two-run average of 267.9 mph (431.072 kph) with a new Veyron 16.4 Super Sport model, smashing the 253.76-mph record set by a standard Veyron 16.4 in 2005. It also betters the existing world-record mark of 256.23 mph (412.28 kph) established by Shelby SuperCars with its Ultimate Aero on a 12-mile stretch of road in Nevada in 2007. Confirming details of the attempt run under tight security at parent company Volkswagen's 13-mile Ehra-Lessien test track in late June, Bugatti says the new Super Sport set the record in the hands of its test driver, Pierre-Henri Raphanel, and under the auspices of officials from the Guinness Book of Records.

Autoweek in review: The Cayenne Turbo S gets more power, we drive the new Aston Martin Vanquish, and a Porsche 962 for the street

The 2013 Porsche Cayenne Turbo S will now have 542 horsepower. The Cayenne Turbo S will sprint from 0 to 62 mph in 4.2 seconds, with a top speed of 176 mph. Click here for more details.