Investigators are focused on speed as a major factor in the crash of a Porsche Carrera GT that killed  “Fast & Furious” actor Paul Walker and driver Roger Rodas. Get all the latest car biz news in the Executive Briefing.    -photo by julianapaulo 

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+   Officials say it could take some time before investigators know how fast a Porsche was traveling when it crashed in a Santa Clarita business park on Saturday, killing actor Paul Walker and friend Roger Rodas. More at the Los Angeles Times.

+   Among five former owners of the 2005 Porsche Carrera GT in the fatal Paul Walker crash was IndyCar driver Graham Rahal. More at Autoweek.

+   General Motors has promoted Matthew Tsien to president of its China and consolidated international operations, replacing Robert Socia. More at The Detroit News.

+   Under new ownership, Saab is scheduled to resume production of the 9-3 sedan at its Trollhattan, Sweden plant today. More at Reuters.

+  Reacting to extraordinary numbers of juvenile traffic deaths in China, authorities are pushing hard for greater use of child safety seats. More at Bloomberg.com.

+   A newly-minted NASCAR subsidiary has purchased Iowa Speedway in Newton, Iowa from  the Clement family, owners of Featherlite. More at National Speed Sport News. 

+   Enterprise Holdings’ National, Enterprise, and Alamo rental car brands swept the top spots in customer satisfaction, according to a J.D. Power study. More at USA Today.

+   Retired Funny car racer Gordon “240 Gordie” Bonin, holder of nine NHRA national event wins, has passed away at 65. More at Bangshift.com.

+   Volvo has formally introduced its long-wheelbase S60L sedan for the China market at the Guangzhou Motor Show. More at CarBuzz.com.

+   A Mercedes-Benz AMG coupe in camouflage wrap and a 2015 C-class wagon have been spied and photographed. More at Motor Trend.

+   Quantum Motorsport is still working on a deal to buy into the Lotus Formula 1 team, Quantum sources say. More at Yahoo! Sport UK.

For the previous Executive Briefing from November 29, click here.

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