Coming to dealerships in late 2007, but on view at the February Chicago Auto Show is the 2008 GMC Yukon Hybrid. The hybrid expands GMC’s Professional Grade lineup, and it features the world's first two-mode hybrid propulsion system in an SUV. GM is teaming up with DaimlerChrysler and BMW Group to co-develop the two-mode hybrid system, which is a patented fuel-saving technology. The first mode of the system is for low speed and light loads. In this mode, the hybrid system can operate with electric power only, engine power only and any combination of engine and electric power. Next, the second mode kicks in at highway speeds. In addition to electric assist, the second mode integrates sophisticated electronic controls, such as Active Fuel Management, cam phasing and late-intake valve closure, to allow even more efficient engine operation with electric motors less than half the size of a traditional “one-mode” hybrid system. Full eight-cylinder aluminum small-block Vortec engine power is provided when conditions demand it, such as passing, climbing a steep grade, or towing up to 6,000-pounds. Visually, the ’07 Yukon includes a new hood, front and rear fascias and a sleek GMC grille.

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