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Kenworth Truck Company’s medium duty hybrid-electric truck provides a state-of-the-art, fuel-efficient and environmentally-friendly addition to a fleet. Kenworth’s goal for its new medium duty hybrid is to enhance fuel economy by up to 30 percent in start-and-stop applications, such as pickup and delivery and utility trucks. Above 30 mph, the Kenworth hybrid operates like a standard diesel vehicle with all power coming from the engine during steady driving conditions. Below 30 mph, it uses a combination of diesel and electricity with the system automatically switching between the two modes of operation. Electricity generated through regenerative braking is stored and used for acceleration, assisting the diesel engine.