ANN ARBOR, MI – A Ford Expedition SUV retrofitted with a diesel-hydraulic hybrid powertrain system patented by the U.S. Environmental Protection Agency delivers nearly twice the fuel economy of its conventionally powered counterpart, says the agency. Prototype diesel-hydraulic hybrid is Ford Expedition modified with hydraulic launch assist. The EPA says the hydraulic hybrid, developed jointly with powertrain-engineering specialist FEV Engine Technology Inc., will be unveiled at ...

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