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Most hybrid owners don't buy another hybrid, Polk study says

Almost two-thirds of U.S. hybrid buyers returning to the market in 2011 chose something besides another hybrid. Excluding owners of the best-selling Toyota Prius, the repurchase rate among other hybrid buyers dropped to 22 percent, according to a Polk study released today.

Mercedes-Benz starts voluntary recall of 2013 SL-class

Mercedes-Benz has initiated a voluntary recall for its 2013 SL-class due to an issue with the air-conditioning system. Under “worst-case condition” testing during a severe front impact, a rupture of the refrigerant line is possible, which could cause a fire in the engine compartment. According to the report from Mercedes Benz, the refrigerant does not ignite under normal conditions.

ZF boss thinks 9 speeds is enough for transmissions

The nine-speed transmission might be where the race to add gears ends, ZF Friedrichshafen CEO Stefan Sommer said. He referred to nine speeds as the "natural limit" because going beyond that number adds weight and complexity that cannot be offset by gains in fuel efficiency. "There is no hard line, but you have to consider the law of diminishing returns.