GMC Sierra 4WD AT4 Fuel Economy History

MPG by year — EPA official data.

Best MPG Year

2021

24 MPG combined

Latest Model

2021

24 MPG combined

Year	Engine	City	Hwy	Combined	Fuel Cost/yr
2021	Diesel Diesel	22	26	24	$3,500	Details →
2020	Diesel Diesel	22	26	24	$3,500	Details →