2026 Mercedes-Benz GLS-Class Specs, MPG & Trims
EPA fuel-economy data and specifications for the 2026 Mercedes-Benz GLS-Class (15–21 MPG combined) across 4 listed configurations.
Overview
- Body class
- Standard Sport Utility Vehicle 4WD
- Drive
- All-Wheel Drive
- Engine
- 8-cyl, 4.0 L; 6-cyl, 3.0 L
- Fuel type
- Premium Gasoline
- Combined MPG
- 15–21 MPG
- Annual fuel cost
- $3,900–$5,500
- Configurations
- 4
MPG & fuel economy
City, highway and combined values below are EPA estimates. Where a powertrain has several configurations, the table shows the lowest–highest reported value. Electric configurations use MPGe.
| Powertrain | City | Highway | Combined | Annual fuel cost | CO2 |
|---|---|---|---|---|---|
| 6-cyl 3.0 L · Premium Gasoline · All-Wheel Drive | 19 | 24 | 21 | $3,900 | 428 g/mi |
| 8-cyl 4.0 L · Premium Gasoline · All-Wheel Drive | 13–15 | 18–20 | 15–17 | $4,850–$5,500 | 538–585 g/mi |
Configurations & engine comparison
Each row is one configuration/engine combination reported by the EPA for this model year. Missing EPA values are shown as —.
| Configuration / engine | Drive | Transmission | Cyl. | Displ. (L) | Fuel type | City | Hwy | Comb. | Annual cost |
|---|---|---|---|---|---|---|---|---|---|
| AMG GLS63 4matic Plus | All-Wheel Drive | Automatic 9-spd | 8 | 4.0 | Premium Gasoline | 15 | 20 | 17 | $4,850 |
| GLS450 4matic | All-Wheel Drive | Automatic 9-spd | 6 | 3.0 | Premium Gasoline | 19 | 24 | 21 | $3,900 |
| GLS580 4matic | All-Wheel Drive | Automatic 9-spd | 8 | 4.0 | Premium Gasoline | 14 | 20 | 16 | $5,150 |
| GLS600 4matic Maybach | All-Wheel Drive | Automatic 9-spd | 8 | 4.0 | Premium Gasoline | 13 | 18 | 15 | $5,500 |
Frequently asked questions
What is the combined MPG of the 2026 Mercedes-Benz GLS-Class?
According to EPA data, the 2026 Mercedes-Benz GLS-Class is rated at 15–21 MPG combined for its conventional-fuel configurations.
How many cylinders does the 2026 Mercedes-Benz GLS-Class have?
The EPA data lists 6 and 8 cylinders across its configurations.
What fuel type does the 2026 Mercedes-Benz GLS-Class use?
It uses Premium Gasoline.
What is the annual fuel cost of the 2026 Mercedes-Benz GLS-Class?
The EPA estimates annual fuel costs ranging from $3,900 to $5,500.