Good News/Bad News in Detroit

A new report sees big gains in efficiency. But U.S. carmakers still need to slash costs to beat the Japanese

Who says the Japanese are the best when it comes to building cars? A study just released by manufacturing research firm Harbour Consulting shows that six of America's 10 best vehicle assembly plants are run by Ford (F) and General Motors (GM). But there's a catch. Of those six, four are set to close.

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