Chevrolet Silverado 2500 HD 2WD CNG Fuel Economy History

MPG by year — EPA official data.

Best MPG Year

2004

10 MPG combined

Latest Model

2005

9 MPG combined

Year	Engine	City	Hwy	Combined	Fuel Cost/yr
2005	CNG CNG	8	11	9	$4,950	Details →
2004	CNG CNG	9	11	10	$4,450	Details →