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One Lap of the Web: Porsche 959s, the Alfa Romeo 4C and the Mercedes-Benz A45 AMG vs. the BMW M135i

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- When initially produced to satisfy FIA homologation requirements in 1986, the Porsche 959 was the world's fastest street-legal production car.

Porsche Panamera explained in greater detail

Porsche has revealed previously undisclosed details of its new Panamera ahead of a planned public debut at next month's Shanghai motor show. On sale in North America on Oct. 17, the first-ever Porsche sedan will cost more than the BMW M5 and the Mercedes-Benz CLS63 AMG, with prices starting at $89,800 for the base rear-wheel-drive Panamera S and rising to $93,800 for the four-wheel-drive Panamera 4S.

Low-emissions Chevrolet Volt models shipped to California

Californians won't have to wait much longer to take their Chevrolet Volts in high-occupancy vehicle lanes. General Motors began shipping a special version of the range-extended sedan to the state this week. The cars will arrive with a special Low Emissions package that makes it legal to drive them in the Golden State's carpool lanes.