| Model Year | 2017 | 2015 | |
| Model | Mercedes-Benz GLS | BMW X4 | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr SUV | 4dr SUV | |
| Difference | |||
| Wheelbase | 121.1 in | 110.6 in | 10.5 in |
| Length | 202.0 in | 184.3 in | 17.7 in |
| Width | 76.1 in | 74.1 in | 2 in |
| Height | 72.8 in | 63.9 in | 8.9 in |
| Curb Weight | 5400 lb. | 4130 lb. | 1270 lb. |
| Fuel Capacity | 26.4 gal. | 17.7 gal. | 8.7 gal. |
| Headroom, Row 1 | 41.2 in | 40.0 in | 1.2 in |
| Shoulder Room, Row 1 | 58.5 in | 57.2 in | 1.3 in |
| Legroom, Row 1 | 40.3 in | 40.4 in | -0.1 in |
| Headroom, Row 2 | 40.0 in | 37.4 in | 2.6 in |
| Shoulder Room, Row 2 | 58.3 in | 56.0 in | 2.3 in |
| Legroom, Row 2 | 38.5 in | 34.8 in | 3.7 in |
| Headroom, Row 3 | 38.9 in | 0.0 in | 38.9 in |
| Shoulder Room, Row 3 | 50.5 in | 0.0 in | 50.5 in |
| Legroom, Row 3 | 35.0 in | 0.0 in | 35 in |
| Total Legroom | 113.8 in (over 3 rows) | 75.2 in (over 2 rows) | 38.6 in |
| Cargo Volume, Minimum | 16.0 ft3 | 17.7 ft3 | -1.7 ft3 |
| Cargo Volume, Behind R2 | 49.4 ft3 | 17.7 | 31.7 ft3 |
| Cargo Volume, Maximum | 93.8 ft3 | 49.4 ft3 | 44.4 ft3 |
None of our members have yet commented on the seat room and comfort of the 2017 Mercedes-Benz GLS.
None of our members have yet commented on the seat room and comfort of the 2015 BMW X4.