GM also will make two major announcements: One will build on the "Live Green Go Yellow" campaign GM launched Jan. 25 in Washington, D.C.; the second involves a technology enhancement at OnStar. OnStar will celebrate its 10th anniversary at the show.

"GM continues to demonstrate bold and innovative leadership in products and technology," said Brent Dewar, GM vice president, marketing and advertising. "On these fronts and more, GM is truly on a roll."

The Chevy Avalanche was the first to combine the passenger-comfort attributes of an SUV with the cargo capability of a truck. The 2007 model is based on GM's brand-new, full-size SUV platform, which features more power with improved, segment-leading fuel economy and flex-fuel capability on some models; a sharper, more precise driving feel; increased interior refinement and improved quietness; and world-class safety. It will go on sale in the second quarter of 2006.

"Avalanche created the segment and it continues to dominate it. In 2007, the original gets even better," said Dewar.

GM's Chicago Auto Show exhibit also will feature many of the products introduced last month at the Greater Los Angeles Auto Show and North American International Auto Show in Detroit.