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General Motors is developing a hybrid electric concept vehicle from its “Precept” high efficiency vehicle architecture, to satisfy requirements of the Partnership for a New Generation of Vehicles (PNGV) program. This Technology Demonstration Vehicle (TDV) features fundamental architecture that is unconventional compared to contemporary passenger car design, or even to other hybrid vehicles. This paper describes this unique architecture and how the vehicle's most significant features complement each other in harmonious design. It also notes how these features contribute to robustness of efficiency.