Both vehicles have been developed in cooperation with General Motors and BMW at the companies' Hybrid Development Center in Troy, Michigan. The partners are jointly developing a two-mode hybrid system that can be adapted by each to its individual models. In the case of GM, the dual-mode hybrid system is being introduced initially on the Chevrolet Tahoe.Chrysler's version of the two-mode system uses the company's 5.7-liter Hemi V8 and multi-displacement system, which shuts down half the cylinders under part throttle to save fuel. In addition, the dual-mode hybrid can run on the gasoline engine, the electric motor or both. It also features low- and high-speed continuously variable transmission modes (thus the "dual mode" appellation), as well as four fixed gear ratios.
Chrysler says the Hemi Hybrid system is capable of delivering a fuel-economy improvement of 25 percent, including up to 40 percent better mileage in city driving.








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