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New vehicles powered by hybrid electric or clean diesel engines are expected to gain an 11 percent share of U.S. sales by 2012 -- up from 4.8 percent in 2005 -- according to a report by J.D. Power-LMC Automotive Forecasting Services.

The report predicts that hybrids, which accounted for 0.5 percent of the U.S. market in 2004, are expected to increase to 3.5 percent market share by 2012, while diesels are expected to grow from 3 percent in 2004 to 7.5 percent.

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