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U.S. set to raise fuel-economy standard

Government regulators will get their prize of higher fuel-economy standards, and automakers will get the certainty of a national emissions standard, under new rules to be proposed Tuesday by President Barack Obama. The fleet average fuel economy for automakers will rise to 35.5 mpg in 2016 under the president's proposal--10 mpg more than today's mandate. At the same time, the president's proposed rule will cut carbon emissions, thought to be a key factor in global warming.

Dartz improves the G63 AMG 6x6

Half-million-dollar vehicles tend to be polarizing. Why, for example, might one drop extra-large coin on an Aventador Roadster when a Boxster S offers so much usable fun for a fraction of the price? Your average modern sports car is fast enough; why buy a supercar?

Alfa Romeo 4C spied in Michigan

During the Detroit auto show in January, Fiat and Chrysler CEO Sergio Marchionne told us -- in his own irreverent way -- that arrival of the long-promised Alfa Romeo 4C would be delayed once again. But as these spy photos show, testing on the sporty coupe continues even as a debut date remains elusive. This isn't the first time we've caught the 4C testing in the States.