2021 Mercedes-Benz GLS-Class
US · SUV · Standard Sport Utility Vehicle 4WD
The 2021 Mercedes-Benz GLS-Class is listed in the US market as a suv with hybrid power. Every figure below carries the source it came from, and anything our sources do not publish is left out rather than estimated.
- Engine
- Varies by configuration: 4.0L 8-cylinder turbocharged (SIDI; Mild Hybrid), 3.0L 6-cylinder turbocharged (SIDI; Mild Hybrid)
- Power
- Not available
- Torque
- Not available
- Transmission
- 9-speed automatic
- Drivetrain
- 4WD
- Fuel
- Hybrid
- Seating
- Not available
Key Performance & Dimensions
Engine
| Specification | Value | Source |
|---|---|---|
| Engine | Varies by configuration: 4.0L 8-cylinder turbocharged (SIDI; Mild Hybrid), 3.0L 6-cylinder turbocharged (SIDI; Mild Hybrid) | |
| Displacement | 3.0 L to 4.0 L | |
| Cylinders | 6 to 8 | |
| Aspiration | Turbocharged | |
| Fuel type | Hybrid | EPA fueleconomy.gov |
Not available from our sources: Power, Torque.
Transmission and drivetrain
| Specification | Value | Source |
|---|---|---|
| Transmission | Automatic | EPA fueleconomy.gov |
| Gears | 9 | |
| Drivetrain | 4WD | EPA fueleconomy.gov |
Fuel economy and range
| Specification | Value | Source |
|---|---|---|
| Combined | 21 mpg (11.2 L/100 km) to 16 mpg (14.7 L/100 km) | EPA fueleconomy.gov |
| City | 20 mpg (11.8 L/100 km) to 14 mpg (16.8 L/100 km) | |
| Highway | 24 mpg (9.8 L/100 km) to 18 mpg (13.1 L/100 km) |
Not available from our sources: Electric range, Battery capacity.
Trims and configurations
4 configurations listed by our sources. Engines, drivetrains and fuel economy can differ between them.
Recalls
No recall campaigns were found in NHTSA data at the last check. Last checked October 12, 2026.
Data sources
- EPA fueleconomy.gov · retrieved October 12, 2026 · US Government public data
- NHTSA vPIC · retrieved October 12, 2026 · US Government public data
Source checked: October 12, 2026
Data verified: October 12, 2026
Specifications can vary by market, trim, configuration and production date. Confirm with the manufacturer before buying parts or making safety decisions. Report an error.
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Frequently asked questions
What engine does the 2021 Mercedes-Benz GLS-Class have?
Varies by configuration: 4.0L 8-cylinder turbocharged (SIDI; Mild Hybrid), 3.0L 6-cylinder turbocharged (SIDI; Mild Hybrid). Engines can differ by trim, so check the trim list below.
What is the fuel economy of the 2021 Mercedes-Benz GLS-Class?
Combined fuel economy is 21 mpg (11.2 L/100 km) to 16 mpg (14.7 L/100 km), as published by the source shown in the specification table.
Is the 2021 Mercedes-Benz GLS-Class front-wheel, rear-wheel or all-wheel drive?
Drivetrain: 4WD.
Are there recalls for the 2021 Mercedes-Benz GLS-Class?
No recall campaigns were found in NHTSA data when we last checked on October 12, 2026. Recall status can change, so confirm with NHTSA or the manufacturer.