Typical Cost of Fuel for a 2026 GMC Sierra
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It typically costs $3,975 a year to fuel a 2026 GMC Sierra, or about $331 a month. That is the U.S. Environmental Protection Agency's estimate for 15,000 miles of driving a year, at 17 MPG combined: 15.5 in the city and 19 on the highway.
This covers fuel only. Insurance, maintenance, tires, registration and loan payments are separate costs, and what you pay at the pump depends on local prices and how you drive.
Annual fuel cost
$3,975
a year, 15,000 miles
A month
$331
$3,975 ÷ 12
Every 100 miles
$26.50
$3,975 ÷ 15,000 × 100
Across the versions of the 2026 GMC Sierra
EPA rates 22 versions of this model, which differ by trim, engine or drivetrain. The typical figure is the median of them.
Cheapest version
$3,350a year
Typical version
$3,975a year
Costliest version
$5,500a year
3 other versions are not counted here: plug-in hybrid, fuel-cell or all-electric versions, whose costs are not comparable with the rest.
Gas mileage of the 2026 GMC Sierra
EPA ratings for a typical version.
Combined
17MPG
City
15.5MPG
Highway
19MPG
Tailpipe CO2: 524 grams a mile. Fuel: diesel or premium gasoline or regular gasoline.
Where it sits among 2026 models
Each tick is the annual fuel cost of one of the 273 vehicles of model year 2026 on this site. The 2026 GMC Sierra is the 221st cheapest to fuel. Over five years EPA estimates it costs $7,875 more in fuel than the average new vehicle.
What this figure is
It is EPA's own annual cost estimate, the kind printed on a new car's window sticker. It assumes 15,000 miles a year, 55% of them in the city and 45% on the highway, at the national fuel prices EPA uses, which it revises from time to time.
To estimate your own cost, scale it by your mileage: someone who drives 10,000 miles a year would pay about two thirds of the figure. Fuel prices where you live move it too. The gas mileage ratings come from EPA's standard laboratory tests.
Common questions
How much does it cost to fuel a 2026 GMC Sierra for a year?
- EPA estimates $3,975 a year for a typical version, assuming 15,000 miles of driving and EPA's fuel prices. Across its 22 versions the estimate runs from $3,350 to $5,500.
How much is gas for a 2026 GMC Sierra per month?
- About $331 a month: EPA's annual estimate of $3,975 divided by 12. That works out to $26.50 for every 100 miles.
What gas mileage does a 2026 GMC Sierra get?
- A typical version is rated at 17 MPG combined: 15.5 in the city and 19 on the highway. Its versions range from 15 to 25 MPG combined.
What kind of gas does a 2026 GMC Sierra take?
- It depends on the version: EPA lists diesel or premium gasoline or regular gasoline.
Is a 2026 GMC Sierra cheap to fuel compared with other new cars?
- Over five years EPA estimates a typical version costs $7,875 more in fuel than the average new vehicle.
Source
U.S. Environmental Protection Agency and U.S. Department of Energy, Fuel Economy Data
Ratings for model year 2026. Retrieved on October 6, 2026.
fueleconomy.gov dataSource: U.S. Department of Energy and U.S. Environmental Protection Agency, fueleconomy.gov vehicle data. Annual fuel cost is EPA's estimate for 15,000 miles a year (55% city, 45% highway) at the fuel prices EPA assumes; your cost depends on how and where you drive.
Other model years
Other 2026 GMC models
Annual fuel cost for a typical version of each.