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Autoweek in review: What you might have missed

Mercedes-Benz will offer its flagship SLS AMG as the 2013 SLS AMG GT late this year. It will get a boost in horsepower and a refreshing for the upcoming model year. The SRT Viper was caught on the streets of metro Detroit.

Volkswagen's No. 1 ambition: How it plans to rule the world

When Ferdinand Piech celebrates his 74th birthday on April 17 in his villa in Salzburg, Austria, with his wife, Ursula, his youngest son, Gregor, and other close family members, he likely will look back at his career and break into a big, satisfied smile. The chairman of Volkswagen AG's supervisory board wants to turn Volkswagen Group into the world's largest automaker. And he loves it when a plan comes together.

Audi: Electric Turbo, e-Gas & Intelligent Hybrids

Audi are developing new technologies to make cars more efficient including synthetic fuel, electric turbos and intelligent hybrids. Necessity is the mother of invention, and increasingly stringent CO2 emissions targets imposed by governments are making car makers ever more resourceful in their quest to cut emissions. The fact that CO2 emissions are not the bad guy – that’s NOx and particulate emissions – means the environmental benefits are not a panacea for a better climate, but benefits from new technology are nonetheless real.