Among the rush of green car announcements at this week's Detroit auto show, Porsche unveiled two new entries in the green car race. First, the German supercar maker announced a hybrid version of its Cayenne SUV, due in 2010 (photo above). Porsche also said that after its all-new Panamera ( a grand touring, 4-door sedan) debuts next year, a hybrid version will follow sometime after (see diagram below). There's no price information as yet, but these models are likely to cost three, four or more times the cost of a Prius hybrid.
