| Model Year | 2018 | 2007 | |
| Model | Audi A8 / S8 | Mercedes-Benz GL | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr Sedan, ext. | 4dr SUV | |
| Difference | |||
| Wheelbase | 122.9 in | 121.1 in | 1.8 in |
| Length | 207.4 in | 200.3 in | 7.1 in |
| Width | 76.7 in | 75.6 in | 1.1 in |
| Height | 57.9 in | 72.4 in | -14.5 in |
| Curb Weight | 4464 lb. | 5249 lb. | -785 lb. |
| Fuel Capacity | 21.7 gal. | 26.0 gal. | -4.3 gal. |
| Headroom, Row 1 | 37.2 in | 40.1 in | -2.9 in |
| Shoulder Room, Row 1 | 59.1 in | 58.3 in | 0.8 in |
| Legroom, Row 1 | 41.4 in | 40.3 in | 1.1 in |
| Headroom, Row 2 | 39.1 in | 40.6 in | -1.5 in |
| Shoulder Room, Row 2 | 57.8 in | 58.9 in | -1.1 in |
| Legroom, Row 2 | 42.9 in | 39.5 in | 3.4 in |
| Headroom, Row 3 | 0.0 in | 38.5 in | -38.5 in |
| Shoulder Room, Row 3 | 0.0 in | 50.5 in | -50.5 in |
| Legroom, Row 3 | 0.0 in | 34.0 in | -34 in |
| Total Legroom | 84.3 in (over 2 rows) | 113.8 in (over 3 rows) | -29.5 in |
| Cargo Volume, Minimum | 14.2 ft3 | 14.3 ft3 | -0.1 ft3 |
| Cargo Volume, Behind R2 | 14.2 | 43.8 ft3 | -29.6 |
| Cargo Volume, Maximum | 14.2 ft3 | 83.3 ft3 | -69.1 ft3 |
None of our members have yet commented on the seat room and comfort of the 2018 Audi A8 / S8.
| 2007 Mercedes-Benz GL Seat Room and Comfort: Pros | ||
| Year | Body/Powertrain | Comment |
| 2008 | 4dr SUV turbocharged 215hp 3.0L V6 Diesel 7-speed shiftable automatic AWD |
Excellent, usable 3rd row seating see full Mercedes-Benz GL review |
| 2008 | 4dr SUV turbocharged 215hp 3.0L V6 Diesel 7-speed shiftable automatic AWD |
Roomy and adjustable. see full Mercedes-Benz GL review |
| 2008 | 4dr SUV turbocharged 215hp 3.0L V6 Diesel 7-speed shiftable automatic AWD |
Second row is good. Third row is EXCELLENT. Bigger than some of the monster American SUVs. see full Mercedes-Benz GL review |
| 2007 | 4dr SUV 335-horsepower 4.7L V8 7-speed shiftable automatic AWD |
Large third row seating to accomodate adults in far back row... see full Mercedes-Benz GL review |