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Volvo tests flywheel technology to cut fuel use

Volvo is testing flywheel technology--being used in Formula One racing to give cars an extra boost--as a technology that could help cut fuel use in future cars by as much as 20 percent. Flywheels recapture energy normally lost as heat during braking. That energy can then be used to help propel the car.

Citroen DS Wild Rubis concept (2013) first official pictures

Citroen's DS Wild Rubis concept shows how a DS-badged SUV could look, and could lead to a high-riding model for the 4x4-loving Chinese market. It's the latest concept to showcase a possible future styling direction for Citroen's DS sub-brand, the quasi-premium offshoot of Citroen's main range. Tell me about the Citroen DS Wild Rubis Riding on 21in wheels, the Wild Rubis has a Mercedes ML-class-sized footprint, but is lower than a conventional posh-roader, standing 1.59m tall – about the same height as Citroen's own DS4 crossover.

Le Mans 24-hour race 2010: CAR's guide to the classes

This year, teams are split into two categories: Prototype and Grand Touring. The former are cars created specifically for endurance racing, the latter are homologated from road cars. Each category is then split into two further disciplines – one a higher performance grade, the other slightly lower.