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Study

As fuel prices keep falling across the US, sales of fuel efficient vehicles keep going with them. By AutoblogGreen's tally, the market for green cars, which includes diesels, is down 6.4 percent through November 2014. However, there is a bright spot in the bleak news. Plug-in sales are actually up for the year by about 30 percent. A report from the US Energy Information Administration, a branch of the Department of Energy, finds that this segment is still growing. Though, their popularity is sti