GM says the 2009 GMC Sierra hybrid gets a 25 percent improvement in fuel economy without compromising performance, while its GMC Denali XT concept -- a low-slung, muscular utility vehicle -- would get 50 percent better fuel economy than a comparable small pickup.
The Sierra is the next large GM vehicle to get the company's new two-mode hybrid system, which has also been introduced on the Chevrolet Tahoe and GMC Yukon sport utility vehicles and the Chevrolet Silverado pickup. The SUVs are expected to go on sale early this year, while the Silverado and Sierra are scheduled to hit the market at the end of 2008.
The two-mode system got a lot of buzz late last year at the Los Angeles Auto Show, where the hybrid Chevrolet Tahoe was named the 2008 Green Car of the Year by the Green Car Journal.
Like single-mode hybrid systems used by Toyota, Ford and others, the two-mode runs without the gas engine at low speeds. At higher speeds, however, the electric motor in the two-mode hybrid contributes more power. The two-mode system also is better for towing.
GM says the Sierra can drive up to 30 mph on just electricity, which is stored during braking and cruising in a 300-volt battery. When the gas engine is used, the hybrid system helps the 6-liter V-8 engine run longer in its more economical four-cylinder mode.
GM says the hybrid Sierra can tow up to 6,100 pounds. The non-hybrid GMC Sierra 1500 can tow up to 10,500 pounds.
It remains to be seen whether pickup buyers, who have historically saved on fuel costs by choosing diesel models, will adopt hybrid systems. Hybrid systems cost more than gas engines, but pickup drivers tend to drive longer distances so they could recoup the premium more quickly.
GM's Denali XT concept is built on a unibody frame, rather than a truck frame, for a smoother ride and better economy. It's the first GM vehicle that combines an ethanol-capable engine with the two-mode hybrid system.
NEW HYBRIDS: General Motors is introducing a hybrid full-size pickup and a concept hybrid truck this week at the Chicago Auto Show. The 2009 GMC Sierra is the next large GM vehicle to get the company's two-mode hybrid system:
PERFORMANCE: The Sierra hybrid will get a 25 percent improvement in fuel economy without compromising performance. The GMC Denali XT concept would realize 50 percent better fuel economy than a comparable small pickup.
RECENT OFFERINGS: The Denali XT comes on the heels of Toyota's compact hybrid truck concept, the A-BAT, which was introduced at last month's North American International Auto Show in Detroit.
-- Associated Press