2018 Mercedes-Benz GLS-Class
3 configurations — EPA fuel economy ratings
| Trim / Variant | City MPG | Hwy MPG | Combined MPG | Fuel | Drive | Engine | Transmission |
|---|---|---|---|---|---|---|---|
| AMG GLS63 | 13 | 18 | 15 | Premium Gasoline | 4-Wheel Drive | 5.5L 8-cyl Turbo | Automatic 7-spd |
| GLS450 4matic | 17 | 22 | 19 | Premium Gasoline | 4-Wheel Drive | 3L 6-cyl Turbo | Automatic 9-spd |
| GLS550 4matic | 14 | 19 | 16 | Premium Gasoline | 4-Wheel Drive | 4.7L 8-cyl Turbo | Automatic 9-spd |