As with the Escalade hybrid and the Chevrolet Tahoe hybrid (which we
recently tested and generally enjoyed), the Silverado hybrid is a full
(two-mode) hybrid. As such, it is able to get on with electric power—
up to 30 mph—or gasoline or a combination of both. In the interest of
retaining a high tow rating, which is more than respectable at 6100
pounds, as well as a 1400-pound cargo payload, the Silverado hybrid
(like all of GM’s full-size-truck hybrids) uses a 6.0-liter V-8 with
cylinder deactivation and variable cam timing mated to a 300-volt
electrical system that also provides power to the electric power-
steering system and accessories.
http://www.zone-car.com/?2009-chevrolet-silverado-hybrid.php
