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Mercedes-Benz B-Class aerodynamics tested [w/video]

Mercedes-Benz has produced a video testing the aerodynamics of its new B-Class – which it claims is the most aerodynamically efficient car in the world – using a wind tunnel and fluorescent paint. The W245-generation B-Class has the lowest aerodynamic drag in its segment with a Cd of just 0.26, thanks to features such as serrated front wheel arch spoilers, optimized cooling airflow and a Pagoda roof to help airflow over its profile. The car's aero properties were put to the test at the MIRA vehicle test facility in the UK using fluorescent paint in 60mph winds to highlight its flow dynamics, only visible under UV lights.

Automakers sign up to Apple 'Eyes Free' Siri button

Apple has announced that the leading carmakers have signed up for the addition of an ‘Eyes Free' button that will activate Siri for in-car Apple products. Siri – the innovative voice activation system developed for the 4S, Apple's latest iPhone – can be activated by pressing a steering wheel mounted button and allows the driver to access the same information available when not driving. Apple reported at its 2012 Worldwide Developer's Conference that Mercedes-Benz, BMW, Audi, Toyota, Land Rover, Jaguar, Chrysler and Honda have all signed up to offer Eyes Free within the next 12 months.

Tesla has room to grow with the Model S sedan, Calif. factory

We got a brief ride in a prototype of the Tesla Model S all-electric sedan, and as far as we could tell from the passenger seat, it seemed like a luxury performance bargain for just $57,400. Of course, being just a passenger means any evaluation is more or less just a guess. We should get to drive one of them sometime before the fully finished models go on sale next summer and then we will have a more definitive take on the car.