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Photos: Close-up of the 2008 GMC Yukon Hybrid

GM's two-mode hybrid system is the biggest news in the hybrid world since the introduction of Toyota's wildly successful Hybrid Synergy Drive. The two-mode system, which will debut later this year in the GMC Yukon and the Chevy Tahoe, makes use of advanced drive train technology to improve the mileage and the environmental image of two of Detroit's most popular full-size SUVs.