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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.

Optima Sports pushes two new tire innovations

WITH VIDEO -- If John Scott has his way, every car on the road will be shod with tires featuring built-in camber. Scott is the owner of Wisconsin-based Optima Sports, a small automotive-engineering firm, and inventor of Camber Tires--tires with a constantly decreasing diameter. According to Scott, his tires offer multiple benefits, including enhanced handling, increased stability, reduced tread noise, improved fuel economy and better safety by reducing rollovers.

GreenGT H2 completes first laps ahead of 2013 Le Mans

Are we entering the era of the eco-friendly racing car? French outfit GreenGT could be spearheading the push, with the announcement its new H2 hydrogen racing car has completed its first successful racing laps testing at the Magny-Cours circuit in France. The wacky-looking hydrogen hybrid racing car will compete in the 2013 Le Mans 24 Hours endurance race, filling the ‘experimental competitor’ pit garage vacated by the radical-looking 2012 Nissan DeltaWing.