Can Diesel Save Detroit?

Plug-in vehicles held the spotlight in the turnaround plans drafted by General Motors and Chrysler in recent months, and Congress has allocated billions of dollars for investment in plug-in car and battery research, production, and infrastructure. But there's another technology in the mix that could end up doing more to help automakers meet tightening fuel-economy standards over the near term, while also creating new opportunities for entrepreneurs: diesel.

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