Fuel economy details
GMC Sierra Cab Chassis 2026
EPA fuel-economy estimates for 1 version of this vehicle. Review the published configuration below.
16combined MPG
15 / 18city / highway MPG
$4,200estimated annual fuel cost
How to use these estimates
EPA ratings use standardized city and highway tests, making them a useful starting point for comparing similar vehicles. For model years with several versions, choose the powertrain that matches the vehicle you are considering before relying on a rating.
Your actual fuel or electricity use can vary with weather, payload, driving style, maintenance, and local prices.
SIDI · Automatic 10-spd
16 combined MPGFuel typeRegular Gasoline
Vehicle classSpecial Purpose Vehicle 2WD
DriveRear-Wheel Drive
TransmissionAutomatic 10-spd
Tailpipe CO₂551 g/mi
EPA base modelSierra
Start-stop systemYes
Efficiency and cost
- EPA fuel economy score
- 3
- EPA greenhouse gas score
- 3
- Estimated annual petroleum use
- 18.6 barrels
- Five-year fuel-cost comparison
- costs $9,000 more
Where these numbers come from
Source: EPA FuelEconomy.gov. This page was last updated on October 3, 2026. Learn more about how we use vehicle data.