For 2013, extended-cab 2500 HD models equipped with the standard 6.0-liter V8 can be had with a new bi-fuel system that accommodates both gasoline and compressed natural gas (CNG). Two new exterior colors (Sonoma Red Metallic and Heritage Blue Metallic) round out the changes.
The 2012 GMC Sierra HD sees a few improvements for this model year. A new hard-drive navigation radio is offered, while Work Truck models gain cruise control and lockable spare tire. Denali trims gain as standard equipment heated and cooling front seats, a heated steering wheel, a rearview camera and, on 3500 dually models, 17-inch polished wheels.
Even though, for several decades, GMC has represented little more than a rebadged Chevrolet, for 2007 GMC made a concerted effort to distinguish itself from its divisional sibling, while GM's engineers made a concerted effort to increase the differentiation between the Heavy Duty pickups and their lighter-duty counterparts.