| Model Year | 2017 | 2020 | |
| Model | Mercedes-Benz GLS | Porsche 718 Spyder | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr SUV | 2dr Convertible | |
| Difference | |||
| Wheelbase | 121.1 in | 97.8 in | 23.3 in |
| Length | 202.0 in | 174.5 in | 27.5 in |
| Width | 76.1 in | 71.0 in | 5.1 in |
| Height | 72.8 in | 49.6 in | 23.2 in |
| Curb Weight | 5400 lb. | 3206 lb. | 2194 lb. |
| Fuel Capacity | 26.4 gal. | 16.9 gal. | 9.5 gal. |
| Headroom, Row 1 | 41.2 in | 0.0 in | 41.2 in |
| Shoulder Room, Row 1 | 58.5 in | 0.0 in | 58.5 in |
| Legroom, Row 1 | 40.3 in | 0.0 in | 40.3 in |
| Headroom, Row 2 | 40.0 in | 0.0 in | 40 in |
| Shoulder Room, Row 2 | 58.3 in | 0.0 in | 58.3 in |
| Legroom, Row 2 | 38.5 in | 0.0 in | 38.5 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) | 0 in (over 1 rows) | 113.8 in |
| Cargo Volume, Minimum | 16.0 ft3 | 9.4 ft3 | 6.6 ft3 |
| Cargo Volume, Behind R2 | 49.4 ft3 | 9.4 | 40 ft3 |
| Cargo Volume, Maximum | 93.8 ft3 | 9.4 ft3 | 84.4 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 2020 Porsche 718 Spyder.