Americans plan to keep their cars longer, AutoPacific study finds

In another chilling sign that auto sales are likely to remain stalled, a new study finds that Americans intend to keep their cars longer, indicating a general concern about the industry and the overall economy. The number of new-car buyers planning to keep their rides more than four years has risen to 59 percent, according to a study released Tuesday by California marketing research firm AutoPacific. That's an increase from last year, when about 45 percent of new buyers intended to wait more than four years for their next purchase, and it's up from 2005's tally of 46 percent.

London's GPS-based speed-limit trial puts Big Brother's foot on the gas pedal

A fleet of 12 Toyota Priuses in London have been fitted with GPS-linked speed limiters to measure how drivers respond to having their speed controlled by a computer rather than their own feet. For now, the trial is local to London, run by Transport for London, the agency that manages the city's roads, buses, subways and trains. The agency is using its own fleet of Priuses for the test and will add a bus and a taxi later this year.

Porsche Panamera Turbo S – 0-62mph in 3.8 seconds

Porsche has revealed the full details of its new Panamera Turbo S, and it’s a monster. Set to debut at the 2013 Tokyo Motor Show in November, the Panamera Turbo S is no less than 50hp more powerful than the regular Panamera Turbo, and now sprints 0-62mph in less time than an Audi RS6. Or indeed the last generation Porsche 911 GT3.