The popular car maker General Motors announced it would reveal a new full-size hybrid pickup, as well as a concept hybrid truck with the occasion of the Chicago Auto Show this week.

According to General Motors, the 2009 GMC Sierra model will get a 25 percent improvement in fuel economy, but this won’t compromise its performance. On the other hand, the company’s GMC Denali XT concept hybrid truck will get no less than 50 percent better fuel economy than a similar small pickup.

The 2009 GMC Sierra is the next large vehicle to which General Motors will add its brand new two-mode hybrid system. This system has been already introduced on the GMC Yukon sport utility and on the Chevrolet Tahoe vehicle, as well as on the Chevrolet Silverado pickup. While the SUVs are scheduled to go on sale early in 2008, the Chevrolet Silverado and the 2009 GMC Sierra are set to hit the market at the end of the year.

General Motors’ two-mode hybrid system became very popular last year at the Los Angeles Auto Show, when the Green Car Journal named the company’s Chevrolet Tahoe the 2008 Green Car of the Year.

Thanks to its efficiency, the two-mode hybrid system is far more popular than the single-mode hybrid system, which is currently used by companies such as Toyota Motor or Ford Motor.