Some soccer moms will have to give up hulking SUVs. Carpenters will still haul materials around in pickup trucks, but they will cost more. Nearly everybody else will drive smaller cars, and more of them will run on electricity. The higher mileage and emissions standards set by the Obama administration on Tuesday, which begin to take effect in 2012 and are to be achieved by 2016, will transform the American car and truck fleet.
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