Nissan diesel Frontier

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Nissan Motor Co. is exploring plans to put a small but powerful four-cylinder Cummins diesel engine in its mid-sized Frontier pickup. The diesel engine would improve the Frontier's fuel efficiency by more than 35 percent over the current 4.0 V-6-powered version of the truck, said Fred Diaz, Nissan's senior vice president for U.S. sales & marketing, parts and service.