GMC Sierra 4WD AT4X Fuel Economy History

MPG by year — EPA official data.

Best MPG Year

2026

19 MPG combined

Latest Model

2026

19 MPG combined

Year	Engine	City	Hwy	Combined	Fuel Cost/yr
2026	Diesel Diesel	19	20	19	$4,450	Details →
2025	Diesel Diesel	19	20	19	$4,450	Details →
2024	Diesel Diesel	19	20	19	$4,450	Details →
2023	Premium	14	17	15	$5,450	Details →