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The first SRT Viper is sold, we spot an exotic XTS, and the 2013 SVT Raptor offers more off-road fun, this week's Autoweek in review

The first SRT Viper crossed the block at Barrett Jackson in Orange County this past week, for a cool $300,000. All the proceeds will go to the Austin Hatcher Foundation, a charity to help families and children affected by pediatric cancer. While the Cadillac XTS hasn't been a stranger on public roads around Michigan, this heavily camouflaged example is a bit of a mystery.

Carlos Ghosn's automaker mantra: Go big or you'll go away

Size matters in auto company survival, Renault and Nissan CEO Carlos Ghosn told an audience in Detroit on Tuesday. To cope with the escalating costs and scope of a global industry, successful automakers must complete a trifecta--be able to compete in every technology, every market and every segment, Ghosn said during a luncheon speech at the Detroit Economic Club “No 3 million-unit carmaker can make it,” Ghosn said, explaining why his Renault-Nissan alliance forged an alliance with Germany's Daimler AG. Competency in one or two of the three skills is not enough, and only very large companies can afford all three, he said.

White House pushes automakers toward 54.5-mpg target by 2025

The White House is pushing automakers to agree by Wednesday to a corporate average fuel economy target of 54.5 mpg by 2025--a figure 1.7 mpg less than the 56.2 mpg standard it floated earlier this month. The easing of the White House plan stems from a concession to makers of light trucks and SUVs, and particularly larger vehicles in that segment, such as Ford's F-150, sources said. The latest White House proposal, the most definitive of any it has put forth, calls for a 5 percent annual mileage increase for cars from 2017-2025, said industry and congressional officials who asked not to be named because their discussions with the White House are confidential.