GMC Sierra 2WD
20.7 MPG The 2026 GMC Sierra 2WD is EPA-rated at 20.7 MPG combined (19 city / 23 highway). Over 15,000 miles a year that is about 725 gallons, $2319 a year in fuel, or $0.155 per mile at $3.20/gal.
Across its full 2020–2026 run it averages 19.6 MPG, improving by 1.2 MPG over 7 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.121 | $1208 | $1812 | $2415 |
| $3.00/gal | $0.145 | $1449 | $2174 | $2899 |
| $3.20/gal | $0.155 | $1546 | $2319 | $3092 |
| $3.50/gal | $0.169 | $1691 | $2536 | $3382 |
| $4.00/gal | $0.193 | $1932 | $2899 | $3865 |
| $4.50/gal | $0.217 | $2174 | $3261 | $4348 |
| $5.00/gal | $0.242 | $2415 | $3623 | $4831 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 20.7 MPG | 19 | 23 | $3300 | 460 | 3 |
| 2025 | 19.8 MPG | 18 | 22.4 | $3340 | 468 | 5 |
| 2024 | 19.1 MPG | 17.3 | 21.7 | $3400 | 480 | 7 |
| 2023 | 19.7 MPG | 18 | 22 | $3286 | 468 | 7 |
| 2022 | 19.3 MPG | 17.5 | 22.1 | $3363 | 477 | 8 |
| 2021 | 18.9 MPG | 17.2 | 22.6 | $3439 | 483 | 9 |
| 2020 | 19.5 MPG | 17.8 | 22.9 | $3331 | 467 | 8 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 29 standard pickup trucks 2wd models tracked here, the GMC Sierra 2WD ranks 5 on current figures, against a class average of 18.7 MPG.
Closest more-efficient alternatives in the same class: Nissan Frontier 2WD (21), Mazda B2300 2WD (22), Ford Ranger 2WD (23), Ram 1500 HFE 2WD (23).
Tailpipe CO₂ is rated at 460 grams per mile, which works out to roughly 6.9 tonnes a year at 15,000 miles.
Questions
What MPG does the GMC Sierra 2WD get?
The 2026 GMC Sierra 2WD is rated at 20.7 MPG combined by the EPA — 19 city and 23 highway. Across all 7 model years in the database it averages 19.6 MPG, ranging from 16 to 26 depending on year and trim.
How much does a GMC Sierra 2WD cost in fuel per year?
At 20.7 MPG and 15,000 miles a year, it burns about 725 gallons — roughly $2319 a year with fuel at $3.20 a gallon, or $0.155 per mile. The EPA's own published annual figure for the 2026 model is $3300.
Has the GMC Sierra 2WD become more efficient over time?
Yes. It has gone from 19.5 MPG in 2020 to 20.7 in 2026 — an improvement of 1.2 MPG, or 6% across 7 model years.
Is the GMC Sierra 2WD efficient for its class?
It ranks 5 of 29 in the Standard Pickup Trucks 2WD class on current figures, against a class average of 18.7 MPG. That is 2.0 better than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.