Mercedes-Benz GLS-Class MPG by Year & Engine (EPA)
EPA fuel-economy ratings for every rated Mercedes-Benz GLS-Class model year from 2017 to 2026 — each engine and transmission with its official city, highway and combined figures. Over these years the GLS-Class has been offered with 3.0L 6-cyl, 4.0L 8-cyl, 4.7L 8-cyl engines; the most efficient version is the 2026 (up to 21 MPG combined). Every rated gas version calls for premium gasoline. Data: U.S. Department of Energy & EPA, fueleconomy.gov; prices are live medians from VehiSales listings.
Mercedes-Benz GLS-Class fuel economy by year
| Year | Combined | Engines | Median used price | For sale |
|---|---|---|---|---|
| 2026 | 15–21 MPG | 3.0L 6-cyl, 4.0L 8-cyl | — | — |
| 2025 | 15–21 MPG | 3.0L 6-cyl, 4.0L 8-cyl | — | — |
| 2024 | 16–21 MPG | 3.0L 6-cyl, 4.0L 8-cyl | $97,960 | 9 listings |
| 2023 | 17–20 MPG | 3.0L 6-cyl, 4.0L 8-cyl | $62,995 | 50 listings |
| 2022 | 17–20 MPG | 3.0L 6-cyl, 4.0L 8-cyl | $49,491 | 54 listings |
| 2021 | 16–21 MPG | 3.0L 6-cyl, 4.0L 8-cyl | $81,191 | 6 listings |
| 2020 | 18–21 MPG | 3.0L 6-cyl, 4.0L 8-cyl | $32,881 | 13 listings |
| 2019 | 16–18 MPG | 3.0L 6-cyl, 4.7L 8-cyl | $25,494 | 12 listings |
| 2018 | 16–19 MPG | 3.0L 6-cyl, 4.7L 8-cyl | — | — |
| 2017 | 16–19 MPG | 3.0L 6-cyl, 4.7L 8-cyl | $15,900 | 14 listings |
2026 Mercedes-Benz GLS-Class: engines & MPG
The 2026 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 15 to 21 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 19 | 24 | 21 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 14 | 20 | 16 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 13 | 18 | 15 MPG |
2025 Mercedes-Benz GLS-Class: engines & MPG
The 2025 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 15 to 21 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 19 | 24 | 21 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 14 | 19 | 16 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 13 | 18 | 15 MPG |
2024 Mercedes-Benz GLS-Class: engines & MPG
The 2024 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 16 to 21 MPG. Used 2024 models currently list for a median of $97,960 on VehiSales (9 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 19 | 24 | 21 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 14 | 19 | 16 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 14 | 20 | 16 MPG |
2023 Mercedes-Benz GLS-Class: engines & MPG
The 2023 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 17 to 20 MPG. Used 2023 models currently list for a median of $62,995 on VehiSales (50 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 18 | 23 | 20 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 16 | 21 | 18 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 15 | 20 | 17 MPG |
2022 Mercedes-Benz GLS-Class: engines & MPG
The 2022 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 17 to 20 MPG. Used 2022 models currently list for a median of $49,491 on VehiSales (54 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 18 | 24 | 20 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 16 | 21 | 18 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 14 | 20 | 17 MPG |
2021 Mercedes-Benz GLS-Class: engines & MPG
The 2021 GLS-Class was EPA-rated in 3 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 16 to 21 MPG. Used 2021 models currently list for a median of $81,191 on VehiSales (6 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 20 | 24 | 21 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 16 | 21 | 18 MPG |
| GLS600 4matic Maybach | 4.0L 8-cyl | Automatic 9-spd | Premium | 15 | 19 | 16 MPG |
2020 Mercedes-Benz GLS-Class: engines & MPG
The 2020 GLS-Class was EPA-rated in 2 versions (3.0L 6-cyl, 4.0L 8-cyl), with combined economy from 18 to 21 MPG. Used 2020 models currently list for a median of $32,881 on VehiSales (13 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 19 | 23 | 21 MPG |
| GLS580 4matic | 4.0L 8-cyl | Automatic 9-spd | Premium | 16 | 21 | 18 MPG |
2019 Mercedes-Benz GLS-Class: engines & MPG
The 2019 GLS-Class was EPA-rated in 2 versions (3.0L 6-cyl, 4.7L 8-cyl), with combined economy from 16 to 18 MPG. Used 2019 models currently list for a median of $25,494 on VehiSales (12 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 16 | 22 | 18 MPG |
| GLS550 4matic | 4.7L 8-cyl | Automatic 9-spd | Premium | 14 | 19 | 16 MPG |
2018 Mercedes-Benz GLS-Class: engines & MPG
The 2018 GLS-Class was EPA-rated in 2 versions (3.0L 6-cyl, 4.7L 8-cyl), with combined economy from 16 to 19 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 17 | 22 | 19 MPG |
| GLS550 4matic | 4.7L 8-cyl | Automatic 9-spd | Premium | 14 | 19 | 16 MPG |
2017 Mercedes-Benz GLS-Class: engines & MPG
The 2017 GLS-Class was EPA-rated in 2 versions (3.0L 6-cyl, 4.7L 8-cyl), with combined economy from 16 to 19 MPG. Used 2017 models currently list for a median of $15,900 on VehiSales (14 for sale).
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl | Automatic 9-spd | Premium | 17 | 22 | 19 MPG |
| GLS550 4matic | 4.7L 8-cyl | Automatic 9-spd | Premium | 14 | 18 | 16 MPG |
Frequently asked questions
What MPG does a Mercedes-Benz GLS-Class get?
Depending on year and engine, EPA combined ratings for the GLS-Class range from 18 to 21 MPG. The most efficient rated version is the 2026 model year.
What engines does the 2026 Mercedes-Benz GLS-Class have?
The 2026 GLS-Class was EPA-rated with 3.0L 6-cyl, 4.0L 8-cyl engines — see the 2026 table above for each version's exact city/highway figures.
Does the Mercedes-Benz GLS-Class require premium gas?
Yes — every EPA-rated gas GLS-Class version specifies premium gasoline.
Is there a hybrid or electric GLS-Class?
Yes — the ratings above include hybrid versions; look for them in the per-year tables.
https://vehisales.com/research/fuel-economy/mercedes-benz/gls-class.
See also: Mercedes-Benz GLS-Class hub — live listings, prices & reliability · Most fuel-efficient cars by segment · Model price trends. Media inquiries: [email protected].