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Ford C-Max Energi and C-Max Hybrid (2011)

Ford has unveiled two new hybrid vehicles at the 2011 Detroit motor show, the plug-in hybrid C-Max Energi, and the C-Max Hybrid. Both are based on the five-seat Ford C-Max, and the pair go on sale in North America in 2012, while European sales follow in 2013. Both the Ford C-Max Hybrid and Ford C-Max Energi use an Atkinson-cycle (like the Prius) 2.0-litre petrol engine and lithium-ion batteries.

Infiniti LE Concept

Infiniti's new LE Concept, a zero-emissions luxury sedan, has been unveiled at this year's New York auto show. The LE Concept, which is approximately the same length as an the brand's G Sedan, features Infiniti design cues such as the double-arch grille, crescent-cut C-pillar and a strong shoulder line surface. Design features such as the aluminum-alloy wheels with aero treatment, the high rear deck, rear aero diffuser and aero side fin spoilers with integrated illumination contribute to the coefficient of drag of 0.25.

Watch the Porsche 911 GT3 rear-steering system work

A handful of manufacturers have offered four-wheel steering in the past including Honda, Nissan, BMW, Mitsubishi, Mazda and, most recently, Acura and Porsche. On Monday, suspension expert Elephant Racing uploaded a video to its YouTube channel demonstrating the feature on the 2014 Porsche 911 GT3. In most four-wheel steering cars--Acura and Porsche included—a computer controls the movable rear wheels.