AutoSpecData

GMC Sierra Fuel Economy (MPG)

What is the real-world gas mileage of a 2026 GMC Sierra?

The 2026 GMC Sierra gets up to 68 MPG combined (75 city / 61 highway) in EPA testing.

Latest model year (2026):

The GMC Sierra gets up to 68 MPG combined (75 city / 61 highway) in the Auto (A1) trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceTowingBed SizeGas TankDimensionsCurb WeightEV Range

GMC Sierra MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2026Config 1 of 24Auto (A1)—Electricity695964
2026Config 2 of 24Auto (A1)—Electricity746067
2026Config 3 of 24Auto (A1)—Electricity756168
2026Config 4 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel212423
2026Config 5 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel192019
2026Config 6 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel222624
2026Config 7 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel232825
2026Config 8 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2026Config 9 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2026Config 10 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2026Config 11 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162017
2026Config 12 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141615
2026Config 13 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2026Config 14 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141716
2026Config 15 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2026Config 16 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2026Config 17 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141715
2026Config 18 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141615
2026Config 19 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline151916
2026Config 20 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline161717
2026Config 21 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172018
2026Config 22 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline171817
2026Config 23 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172119
2026Config 24 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline182120
2025Config 1 of 23Auto (A1)—Electricity705964
2025Config 2 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel212423
2025Config 3 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel232926
2025Config 4 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel222624
2025Config 5 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel192019
2025Config 6 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141615
2025Config 7 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2025Config 8 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2025Config 9 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2025Config 10 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2025Config 11 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2025Config 12 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2025Config 13 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2025Config 14 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162017
2025Config 15 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2025Config 16 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141715
2025Config 17 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141615
2025Config 18 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline151916
2025Config 19 of 23Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline171918
2025Config 20 of 23Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172119
2025Config 21 of 23Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline161716
2025Config 22 of 23Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline182119
2025Config 23 of 23Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline171817
2024Config 1 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel232925
2024Config 2 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel232724
2024Config 3 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel192019
2024Config 4 of 24Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel212322
2024Config 5 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2024Config 6 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162018
2024Config 7 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2024Config 8 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2024Config 9 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2024Config 10 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162018
2024Config 11 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2024Config 12 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2024Config 13 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2024Config 14 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2024Config 15 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152017
2024Config 16 of 24Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2024Config 17 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141715
2024Config 18 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141615
2024Config 19 of 24Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline151916
2024Config 20 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172119
2024Config 21 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline161716
2024Config 22 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172018
2024Config 23 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline171817
2024Config 24 of 24Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline182220
2023Config 1 of 22Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel212322
2023Config 2 of 22Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel222724
2023Config 3 of 22Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel242926
2023Config 4 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2023Config 5 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151716
2023Config 6 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2023Config 7 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162018
2023Config 8 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2023Config 9 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162018
2023Config 10 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2023Config 11 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162017
2023Config 12 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162017
2023Config 13 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151816
2023Config 14 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2023Config 15 of 22Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2023Config 16 of 22Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141715
2023Config 17 of 22Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline151917
2023Config 18 of 22Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline182019
2023Config 19 of 22Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline192220
2023Config 20 of 22Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline192120
2023Config 21 of 22Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline182019
2023Config 22 of 22Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline171817
2022Config 1 of 34Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel233026
2022Config 2 of 34Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel202321
2022Config 3 of 34Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel222624
2022Config 4 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151917
2022Config 5 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2022Config 6 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2022Config 7 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141916
2022Config 8 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141916
2022Config 9 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162017
2022Config 10 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline131715
2022Config 11 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151716
2022Config 12 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline131715
2022Config 13 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2022Config 14 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151817
2022Config 15 of 34Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2022Config 16 of 34Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141916
2022Config 17 of 34Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline152017
2022Config 18 of 34Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline131714
2022Config 19 of 34Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141816
2022Config 20 of 34Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141615
2022Config 21 of 34Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2022Config 22 of 34Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141816
2022Config 23 of 34Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172018
2022Config 24 of 34Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline192220
2022Config 25 of 34Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline161817
2022Config 26 of 34Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline172018
2022Config 27 of 34Auto 8-spd, 4 cyl, 2.7 L4 2.7LRegular Gasoline192220
2022Config 28 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152017
2022Config 29 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2022Config 30 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141815
2022Config 31 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2022Config 32 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2022Config 33 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152017
2022Config 34 of 34Auto 8-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2021Config 1 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel222624
2021Config 2 of 23Auto 10-spd, 6 cyl, 3.0 L6 3.0LDiesel233026
2021Config 3 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162219
2021Config 4 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152118
2021Config 5 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline162118
2021Config 6 of 23Auto 10-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152117
2021Config 7 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline151917
2021Config 8 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline152016
2021Config 9 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline141916
2021Config 10 of 23Auto 10-spd, 8 cyl, 6.2 L8 6.2LPremium Gasoline162017
2021Config 11 of 23Auto 6-spd, 6 cyl, 4.3 L6 4.3LRegular Gasoline141615
2021Config 12 of 23Auto 6-spd, 6 cyl, 4.3 L6 4.3LRegular Gasoline151917
2021Config 13 of 23Auto 6-spd, 6 cyl, 4.3 L6 4.3LRegular Gasoline162117
2021Config 14 of 23Auto 6-spd, 6 cyl, 4.3 L6 4.3LRegular Gasoline152017
2021Config 15 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141715
2021Config 16 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline151916
2021Config 17 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline142116
2021Config 18 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline142016
2021Config 19 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141816
2021Config 20 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline141815
2021Config 21 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline131814
2021Config 22 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline152117
2021Config 23 of 23Auto 6-spd, 8 cyl, 5.3 L8 5.3LRegular Gasoline131714

Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.

GMC Sierra data analysis

How GMC Sierra combined fuel economy varies

Across 150 configurations recorded for the 2021 through 2026 GMC Sierra, combined fuel economy runs from 14 MPG to 68 MPG. The strongest figure belongs to the 2026 GMC Sierra (Auto (A1)) at 68 MPG, and the weakest to the 2022 car (Auto 10-spd, 8 cyl, 6.2 L) at 14 MPG — a spread of 386%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the GMC Sierra would be misleading.

What changed for 2026

Average combined fuel economy for the 2026 GMC Sierra is 24 MPG, against 19.8 MPG for the 2025 car — it rose by 4.1 MPG. That is a real improvement, and it is the kind of change worth paying the newer-year premium for if this figure drives your decision.

How to read this GMC Sierra data

This page lists every 2021 through 2026 GMC Sierra record we hold for this measurement — 150 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.

Configurations behind these GMC Sierra numbers

The 2021 through 2026 GMC Sierra entries here cover variants including Auto (A1), Auto 10-spd, 6 cyl, 3.0 L, Auto 10-spd, 8 cyl, 5.3 L, Auto 10-spd, 8 cyl, 6.2 L, Auto 8-spd, 4 cyl, 2.7 L, Auto 6-spd, 8 cyl, 5.3 L, Auto 8-spd, 8 cyl, 5.3 L and Auto 6-spd, 6 cyl, 4.3 L. 2022 is the busiest model year in the record with 34 separate measured configurations, which is why a single quoted combined fuel economy figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.

Where these GMC Sierra figures come from

Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The GMC Sierra record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.

Official Factory Specs vs. AutoSpecData Expert Benchmarks

The EPA highway loop never holds interstate speed. Here is what the same engine does when you sit on the cruise control.

Cruise speedEPA highway specAutoSpecData adjusted MPGFuel you lose
60 mph61 MPG61 MPG0%
65 mph61 MPG55.7 MPG9%
70 mph61 MPG50.9 MPG17%
75 mph61 MPG46.6 MPG24%
80 mph61 MPG42.7 MPG30%

Our Real-World Speed MPG Adjuster re-scales the GMC Sierra EPA highway result with a quadratic drag term (mpg = hwy ÷ (1 + k·(v² − 60²)/60²), k = 0.55 for trucks, SUVs and vans, 0.42 for cars). Wind, roof racks, and a heavy right foot make it worse, never better.

Frequently Asked Questions About Sierra MPG

What is the MPG of the GMC Sierra?

The GMC Sierra gets up to 68 MPG combined (75 city / 61 highway) in the 2026 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which GMC Sierra trim has the best fuel economy?

The Auto (A1) trim offers the best combined fuel economy at 68 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

View full GMC Sierra specs

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