Mercedes-Benz AMG GLS63 4matic Plus
17 MPG The 2026 Mercedes-Benz AMG GLS63 4matic Plus is EPA-rated at 17 MPG combined (15 city / 20 highway). Over 15,000 miles a year that is about 882 gallons, $2824 a year in fuel, or $0.188 per mile at $3.20/gal.
Across its full 2021–2026 run it averages 15.8 MPG, improving by 1 MPG over 6 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 | $0.147 | $1471 | $2206 | $2941 |
| $3.00/gal | $0.176 | $1765 | $2647 | $3529 |
| $3.20/gal | $0.188 | $1882 | $2824 | $3765 |
| $3.50/gal | $0.206 | $2059 | $3088 | $4118 |
| $4.00/gal | $0.235 | $2353 | $3529 | $4706 |
| $4.50/gal | $0.265 | $2647 | $3971 | $5294 |
| $5.00/gal | $0.294 | $2941 | $4412 | $5882 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 17 MPG | 15 | 20 | $4550 | 538 | 1 |
| 2025 | 15 MPG | 14 | 18 | $5150 | 578 | 1 |
| 2024 | 16 MPG | 14 | 18 | $4800 | 564 | 1 |
| 2023 | 16 MPG | 14 | 19 | $4800 | 560 | 1 |
| 2022 | 15 MPG | 14 | 18 | $5150 | 571 | 1 |
| 2021 | 16 MPG | 14 | 18 | $4800 | 559 | 1 |
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 105 standard sport utility vehicle 4wd models tracked here, the Mercedes-Benz AMG GLS63 4matic Plus ranks 67 on current figures, against a class average of 19.7 MPG.
Closest more-efficient alternatives in the same class: Ford Flex AWD (17.5), Land Rover Defender 90 (17.5), BMW X5 xDrive50i (18), Chevrolet Suburban 4WD (18), Ford Expedition 4WD (18).
Tailpipe CO₂ is rated at 538 grams per mile, which works out to roughly 8.1 tonnes a year at 15,000 miles.
Questions
What MPG does the Mercedes-Benz AMG GLS63 4matic Plus get?
The 2026 Mercedes-Benz AMG GLS63 4matic Plus is rated at 17 MPG combined by the EPA — 15 city and 20 highway. Across all 6 model years in the database it averages 15.8 MPG, ranging from 15 to 17 depending on year and trim.
How much does a Mercedes-Benz AMG GLS63 4matic Plus cost in fuel per year?
At 17 MPG and 15,000 miles a year, it burns about 882 gallons — roughly $2824 a year with fuel at $3.20 a gallon, or $0.188 per mile. The EPA's own published annual figure for the 2026 model is $4550.
Has the Mercedes-Benz AMG GLS63 4matic Plus become more efficient over time?
Yes. It has gone from 16 MPG in 2021 to 17 in 2026 — an improvement of 1 MPG, or 6% across 6 model years.
Is the Mercedes-Benz AMG GLS63 4matic Plus efficient for its class?
It ranks 67 of 105 in the Standard Sport Utility Vehicle 4WD class on current figures, against a class average of 19.7 MPG. That is 2.7 worse 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.