Delphi Automotive System Corp.'s four-wheel steering, Quadrasteer, debuts on the 2002 GMC Sierra Denali. GMC says the system provides tighter turns and better hauling capacity.
2001 Sierra C3, 47.3 feet
2002 Sierra Denali with Quadrasteer, 37.4 feet
2001 Sierra C3, 8,700 pounds
2002 Sierra Denali with Quadrasteer, 10,000 pounds