| Model Year | 2009 | 2023 | |
| Model | Mercedes-Benz M-Class | Audi A8 / S8 | |
| Engine | 6.2L V8 DOHC-4v 503 hp@6800 465 lb-ft@5200 |
turbocharged 4.0L V8 Hybrid DOHC-4v 563 hp@6000 590 lb-ft@2000 |
|
| Transmission | 7-speed shiftable automatic | 8-speed shiftable automatic | |
| Drivetrain | AWD | AWD | |
| Body | 4dr SUV | 4dr Sedan, ext. | |
| Difference | |||
| Wheelbase | 2,913 mm | 3,127 mm | -1 mm |
| Length | 4,788 mm | 5,321 mm | -1 mm |
| Width | 1,910 mm | 1,946 mm | 0 mm |
| Height | 1,781 mm | 1,481 mm | 0 mm |
| Curb Weight | 2,310 kg | 2,325 kg | 0 kg |
| Fuel Capacity | 95 L | 82 L | 13 L |
| Headroom, Row 1 | 1,013 mm | 973 mm | -972 mm |
| Shoulder Room, Row 1 | 1,521 mm | 1,501 mm | 0 mm |
| Hip Room, Row 1 | 1,420 mm | 0 mm | 1 mm |
| Legroom, Row 1 | 1,072 mm | 1,054 mm | 0 mm |
| Headroom, Row 2 | 1,011 mm | 978 mm | -977 mm |
| Shoulder Room, Row 2 | 1,519 mm | 1,463 mm | 0 mm |
| Hip Room, Row 2 | 1,427 mm | 0 mm | 1 mm |
| Legroom, Row 2 | 1,016 mm | 1,125 mm | 0 mm |
| Total Legroom | 2,088 mm (over 2 rows) | 2,179 mm (over 2 rows) | 0 mm |
| Cargo Volume, Minimum | 833 L | 354 L | 479 L |
| Cargo Volume, Maximum | 2,050 L | 12.5 | -10.5 L |
| 2009 Mercedes-Benz M-Class Seat Room and Comfort: Pros | ||
| Year | Body/Powertrain | Comment |
| 2008 | 4dr SUV turbocharged 215hp 3.0L V6 Diesel 7-speed shiftable automatic AWD |
Bottom seat cushions are long enough for taller drivers. Padding is not too firm or too soft. Excellent support and an upright, easy-chair seating position, instead of having to extend your legs horizontally to get legroom. Results in no low back pain. see full Mercedes-Benz M-Class review |
| 2009 Mercedes-Benz M-Class Seat Room and Comfort: Cons | ||
| Year | Body/Powertrain | Comment |
| 2008 | 4dr SUV 382-horsepower 5.5L V8 7-speed shiftable automatic AWD |
very still and uncomfortable for long drives see full Mercedes-Benz M-Class review |
None of our members have yet commented on the seat room and comfort of the 2023 Audi A8 / S8.