GMC Sierra Cab Chassis 2WD: MPG and fuel economy by year

The EPA has rated the GMC Sierra Cab Chassis 2WD across 7 model years, from the 2020 GMC Sierra Cab Chassis 2WD through the 2026 GMC Sierra Cab Chassis 2WD. The most recent 2026 GMC Sierra Cab Chassis 2WD returns 16 combined MPG. The most efficient model year was the 2022 GMC Sierra Cab Chassis 2WD at 17 MPG.

Pick a year below to open the full GMC Sierra Cab Chassis 2WD page for that model year. Each year page covers combined, city, and highway MPG, the trim variants the EPA rates separately, the annual fuel cost across three driving patterns, and a year-over-year comparison so you can see whether the car has improved.

Fuel economy by model year

Combined MPG, city MPG, highway MPG, and the EPA's estimated annual fuel cost for every model year of the GMC Sierra Cab Chassis 2WD. Click any year to see the full breakdown for that model year, including trim variants, the drivetrain, and a comparison against other vehicles in its segment.

Year	Model	Combined MPG	City	Highway	Annual fuel cost
2026	2026 GMC Sierra Cab Chassis 2WD	16 MPG	15 MPG	18 MPG	$3,750
2025	2025 GMC Sierra Cab Chassis 2WD	16 MPG	15 MPG	18 MPG	$3,750
2024	2024 GMC Sierra Cab Chassis 2WD	15 MPG	14 MPG	17 MPG	$4,000
2023	2023 GMC Sierra Cab Chassis 2WD	16 MPG	15 MPG	18 MPG	$3,750
2022	2022 GMC Sierra Cab Chassis 2WD	17 MPG	15 MPG	18 MPG	$3,500
2021	2021 GMC Sierra Cab Chassis 2WD	17 MPG	15 MPG	19 MPG	$3,500
2020	2020 GMC Sierra Cab Chassis 2WD	17 MPG	15 MPG	19 MPG	$3,500

How the GMC Sierra Cab Chassis 2WD compares against the Special Purpose Vehicle 2WD class

Buyers usually compare the GMC Sierra Cab Chassis 2WD against other cars in the same EPA class. The list below shows the most efficient cars in the Special Purpose Vehicle 2WD class for the 2026 model year, the latest year on this page. Each link opens the full page for that car.

Source: U.S. EPA fuel economy dataset. Annual fuel cost assumes 15,000 miles of driving per year and a 55% city, 45% highway split.