Fuel consumption: 16 of 16 variants rated.
| # | Variant | Year | Body | Fuel | Fuel consumption |
|---|---|---|---|---|---|
| 1 | Mercedes-Benz Maybach GLS 600 4MATIC | 2023 | SUV | Petrol | 13.9 l/100km (20.3 mpg UK · 16.9 mpg US) |
| 2 | Mercedes-Benz GLS 580 4MATIC AMG Line | 2023 | SUV | Petrol | 13.6 l/100km (20.8 mpg UK · 17.3 mpg US) |
| 3 | Mercedes-Benz GLS 63 AMG 4MATIC+ | 2023 | SUV | Petrol | 13.3 l/100km (21.2 mpg UK · 17.7 mpg US) |
| 4 | Mercedes-Benz Maybach GLS 600 4MATIC | 2020 | SUV | Petrol | 13.1 l/100km (21.6 mpg UK · 18.0 mpg US) |
| 5 | Mercedes-Benz GLS 63 AMG | 2015 | SUV | Petrol | 12.3 l/100km (23.0 mpg UK · 19.1 mpg US) |
| 6 | Mercedes-Benz GLS 63 AMG 4MATIC+ | 2020 | SUV | Petrol | 11.9 l/100km (23.7 mpg UK · 19.8 mpg US) |
| 7 | Mercedes-Benz GLS 500 4MATIC | 2015 | SUV | Petrol | 10.9 l/100km (25.9 mpg UK · 21.6 mpg US) |
| 8 | Mercedes-Benz GLS 450 4MATIC Exclusive Line | 2023 | SUV | Petrol | 10.5 l/100km (26.9 mpg UK · 22.4 mpg US) |
| 9 | Mercedes-Benz GLS 450 4MATIC AMG Line | 2023 | SUV | Petrol | 10.5 l/100km (26.9 mpg UK · 22.4 mpg US) |
| 10 | Mercedes-Benz GLS 450 4MATIC | 2020 | SUV | Petrol | 10.1 l/100km (28.0 mpg UK · 23.3 mpg US) |
| 11 | Mercedes-Benz GLS 580 4MATIC | 2019 | SUV | Petrol | 9.8 l/100km (28.8 mpg UK · 24.0 mpg US) |
| 12 | Mercedes-Benz GLS 400 4MATIC | 2015 | SUV | Petrol | 8.9 l/100km (31.7 mpg UK · 26.4 mpg US) |
| 13 | Mercedes-Benz GLS 450 d 4MATIC Exclusive Line | 2023 | SUV | Diesel | 8.2 l/100km (34.4 mpg UK · 28.7 mpg US) |
| 14 | Mercedes-Benz GLS 450 d 4MATIC AMG Line | 2023 | SUV | Diesel | 8.2 l/100km (34.4 mpg UK · 28.7 mpg US) |
| 15 | Mercedes-Benz GLS 350 d 4MATIC | 2015 | SUV | Diesel | 7.7 l/100km (36.7 mpg UK · 30.5 mpg US) |
| 16 | Mercedes-Benz GLS 400 d 4MATIC | 2019 | SUV | Diesel | 7.1 l/100km (39.8 mpg UK · 33.1 mpg US) |