Those who stick with the GMC's standard gas-fed V-8 should expect to see even worse fuel economy than the diesel option. Inside, the Sierra 2500HD and 3500HD have a huge dashboard that hosts user ...

If prices hold into the next model year, the 2020 Silverado 1500 and Sierra 1500 with the inline-six diesel will come at a $3,890 premium over the 2.7-liter turbo four-cylinder, and a $2,495 ...

A truck brand based around professional grade performance, the 2006 GMC Sierra 2500HD receives strengthened diesel power. The Duramax 6.6-liter turbocharged diesel engine is radically upgraded for ...