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General Motors to offer car sharing via mobile app and OnStar

General Motors has partnered with a San Francisco-based start-up company named RelayRides to enter the car-sharing business. In early 2012, GM vehicle owners in California will be able to use the OnStar system to rent out their cars when they aren't using them. The service will available nationwide for OnStar subscribers by the end of the year.

Mercedes-Benz SL

The next generation Mercedes-Benz SL – code name R231 – is the sixth model to wear the 'Sport Leicht' badge since the first back in 1954. Despite being 50mm longer (at 4612mm) and 57mm wider (1877mm) than its predecessor, the new SL is considerably lighter thanks to its aluminium construction. Its drag Cd figure of 0.27 also helps to increase efficiency.

Top Gear Tonight: Alfa Romeo 4C, McLaren P1, Camp Bastion & SIARPC is Tom Hiddleston

Top Gear tonight sees Richard Hammond in the Alfa 4C Tonight sees the second episode of Top Gear’s 21st series, which sounds to be a lot more interesting than the less than captivating first episode of the new series last week. Richard Hammond gets to go and play on the shores of Lake Como in Italy with a car we expect he’ll like very much – the new Alfa Romeo 4C. Lots of twisty roads and a small but powerful 2-seater Alfa Romeo sound like a recipe for fun, but this is Top Gear so there’s a twist – Clarkson turns up to challenge Hammond in his 4C to a race with Clarkson on a quad bike.