Mercedes-Benz GLS600 4matic Maybach
15 MPG The 2026 Mercedes-Benz GLS600 4matic Maybach is EPA-rated at 15 MPG combined (13 city / 18 highway). Over 15,000 miles a year that is about 1000 gallons, $3200 a year in fuel, or $0.213 per mile at $3.20/gal.
Across its full 2021–2026 run it averages 16 MPG, falling 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 | $0.167 | $1667 | $2500 | $3333 |
| $3.00/gal | $0.200 | $2000 | $3000 | $4000 |
| $3.20/gal | $0.213 | $2133 | $3200 | $4267 |
| $3.50/gal | $0.233 | $2333 | $3500 | $4667 |
| $4.00/gal | $0.267 | $2667 | $4000 | $5333 |
| $4.50/gal | $0.300 | $3000 | $4500 | $6000 |
| $5.00/gal | $0.333 | $3333 | $5000 | $6667 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 15 MPG | 13 | 18 | $5150 | 585 | 1 |
| 2025 | 15 MPG | 13 | 18 | $5150 | 588 | 1 |
| 2024 | 16 MPG | 14 | 19 | $4800 | 574 | 1 |
| 2023 | 17 MPG | 15 | 20 | $4550 | 528 | 1 |
| 2022 | 17 MPG | 14 | 20 | $4550 | 533 | 1 |
| 2021 | 16 MPG | 15 | 19 | $4800 | 539 | 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 GLS600 4matic Maybach ranks 93 on current figures, against a class average of 19.7 MPG.
Closest more-efficient alternatives in the same class: Audi SQ7 (16), Audi SQ8 (16), Bentley Bentayga (16), Bentley Bentayga EWB (16), Cadillac Escalade 4WD (16).
Tailpipe CO₂ is rated at 585 grams per mile, which works out to roughly 8.8 tonnes a year at 15,000 miles.
Questions
What MPG does the Mercedes-Benz GLS600 4matic Maybach get?
The 2026 Mercedes-Benz GLS600 4matic Maybach is rated at 15 MPG combined by the EPA — 13 city and 18 highway. Across all 6 model years in the database it averages 16 MPG, ranging from 15 to 17 depending on year and trim.
How much does a Mercedes-Benz GLS600 4matic Maybach cost in fuel per year?
At 15 MPG and 15,000 miles a year, it burns about 1000 gallons — roughly $3200 a year with fuel at $3.20 a gallon, or $0.213 per mile. The EPA's own published annual figure for the 2026 model is $5150.
Has the Mercedes-Benz GLS600 4matic Maybach become more efficient over time?
No — it has actually gone backwards, from 16 MPG in 2021 to 15 in 2026. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the Mercedes-Benz GLS600 4matic Maybach efficient for its class?
It ranks 93 of 105 in the Standard Sport Utility Vehicle 4WD class on current figures, against a class average of 19.7 MPG. That is 4.7 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.