2020 GMC Sierra
Fuel economy, running costs, emissions and safety · from U.S. EPA and NHTSA data
The 2020 GMC Sierra is sold in the U.S. with diesel and gasoline power. The EPA lists 26 configurations for this model year, with combined economy from 15 to 26 MPG and an estimated annual fuel cost of $3,100 to $4,700 at 15,000 miles.
Key numbers
| Model year | 2020 |
|---|---|
| Vehicle class | Standard Pickup Trucks 4WD |
| Fuel type(s) | Diesel, Gasoline |
| Combined economy | 15-26 MPG |
| Best / worst combined | 26 / 15 MPG |
| Annual fuel cost | $3,100-$4,700 |
| Tailpipe CO₂ | 392-594 g/mi |
| EPA smog rating | 1-6 / 10 |
What it costs to fuel
Across its configurations, the 2020 Sierra costs about $3,100 to $4,700 a year to fuel at the EPA's 15,000-mile basis, averaging roughly $3,796. Over five years that is about $18,981 in fuel alone before maintenance, insurance and depreciation — which is why the running cost, not just the price, decides what a car really costs.
Relative to an average new vehicle, this Sierra configuration spends about $6,750 more on fuel over five years.
For context, the average combined economy of standard pickup trucks 4wd in this dataset is about 18 MPG. The Sierra sits roughly 2 MPG above that mark at its midpoint, making it more efficient than average for its EPA class.
Configurations and fuel economy
| Version | Engine | Drive | Trans | Fuel | Combined | Annual fuel |
|---|---|---|---|---|---|---|
| Sierra 2WD | 3.0L 6-cyl turbo | Rear-Wheel | Automatic | Diesel | 26 MPG | $3,650 |
| Sierra 4WD | 3.0L 6-cyl turbo | 4-Wheel | Automatic | Diesel | 24 MPG | $3,950 |
| Sierra 4WD AT4 | 3.0L 6-cyl turbo | 4-Wheel | Automatic | Diesel | 24 MPG | $3,950 |
| Sierra 2WD | 2.7L 4-cyl turbo | Rear-Wheel | Automatic | Gasoline | 21 MPG | $3,100 |
| Sierra 4WD | 2.7L 4-cyl turbo | 4-Wheel | Automatic | Gasoline | 20 MPG | $3,250 |
| Sierra 2WD | 5.3L 8-cyl | Rear-Wheel | Automatic | Gasoline | 20 MPG | $3,250 |
| Sierra 4WD | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 19 MPG | $3,400 |
| Sierra 4WD | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 18 MPG | $3,600 |
| Sierra 4WD AT4 | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 18 MPG | $3,600 |
| Sierra 4WD AT4 | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 18 MPG | $3,600 |
| Sierra 2WD | 4.3L 6-cyl | Rear-Wheel | Automatic | Gasoline | 17 MPG | $3,800 |
| Sierra 2WD | 5.3L 8-cyl | Rear-Wheel | Automatic | Gasoline | 17 MPG | $3,800 |
| Sierra 4WD | 6.2L 8-cyl | 4-Wheel | Automatic | Gasoline | 17 MPG | $4,700 |
| Sierra 4WD AT4 | 6.2L 8-cyl | 4-Wheel | Automatic | Gasoline | 17 MPG | $4,700 |
| Sierra 4WD | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 17 MPG | $3,800 |
| Sierra 4WD | 4.3L 6-cyl | 4-Wheel | Automatic | Gasoline | 17 MPG | $3,800 |
| Sierra Cab Chassis 2WD | 4.3L 6-cyl | Rear-Wheel | Automatic | Gasoline | 17 MPG | $3,800 |
| Sierra 4WD AT4 | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 16 MPG | $4,050 |
| Sierra Cab Chassis 4WD | 4.3L 6-cyl | 4-Wheel | Automatic | Gasoline | 15 MPG | $4,300 |
| Sierra Cab Chassis 4WD | 5.3L 8-cyl | 4-Wheel | Automatic | Gasoline | 15 MPG | $4,300 |
| Sierra Cab Chassis 2WD | 5.3L 8-cyl | Rear-Wheel | Automatic | Gasoline | 15 MPG | $4,300 |
Emissions, safety and size
The 2020 Sierra records tailpipe CO₂ of 392-594 g/mi, an EPA smog rating of 1-6 out of 10. The EPA classifies it as standard pickup trucks 4wd.
Compare this car
Open the comparison tool to line this 2020 Sierra up against any other vehicle in the database, or jump to other years and trims from the 2020 GMC Sierra overview.
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Data: U.S. EPA FuelEconomy.gov (public domain) and NHTSA SafetyRatings. Figures are EPA estimates; real-world results vary.