| Model Year | 2009 | 2008 | |
| Model | Audi A8 / S8 | Infiniti FX | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr Sedan, ext. | 4dr SUV | |
| Difference | |||
| Wheelbase | 121.0 in | 112.2 in | 8.8 in |
| Length | 204.4 in | 189.1 in | 15.3 in |
| Width | 74.6 in | 75.8 in | -1.2 in |
| Height | 57.3 in | 65.9 in | -8.6 in |
| Curb Weight | 4399 lb. | 4187 lb. | 212 lb. |
| Fuel Capacity | 23.8 gal. | 23.8 gal. | 0 gal. |
| Headroom, Row 1 | 37.4 in | 40.8 in | -3.4 in |
| Shoulder Room, Row 1 | 59.1 in | 56.9 in | 2.2 in |
| Hip Room, Row 1 | 0.0 in | 54.3 in | -54.3 in |
| Legroom, Row 1 | 41.3 in | 43.9 in | -2.6 in |
| Headroom, Row 2 | 38.3 in | 39.5 in | -1.2 in |
| Shoulder Room, Row 2 | 57.5 in | 57.4 in | 0.1 in |
| Hip Room, Row 2 | 0.0 in | 55.0 in | -55 in |
| Legroom, Row 2 | 42.3 in | 35.2 in | 7.1 in |
| Total Legroom | 83.6 in (over 2 rows) | 79.1 in (over 2 rows) | 4.5 in |
| Cargo Volume, Minimum | 14.6 ft3 | 27.4 ft3 | -12.8 ft3 |
| Cargo Volume, Maximum | 14.6 ft3 | 64.5 ft3 | -49.9 ft3 |
None of our members have yet commented on the seat room and comfort of the 2009 Audi A8 / S8.
| 2008 Infiniti FX Seat Room and Comfort: Pros | ||
| Year | Body/Powertrain | Comment |
| 2008 | 4dr SUV 275-horsepower 3.5L V6 5-speed shiftable automatic AWD |
Longest drive was 6 hours and had no discomfort whatsoever. Have ridden for 4 hours in a Toyota Rav4 and was almost in pain after an hour. see full Infiniti FX review |
| 2008 Infiniti FX Seat Room and Comfort: Cons | ||
| Year | Body/Powertrain | Comment |
| 2007 | 4dr SUV 275-horsepower 3.5L V6 5-speed shiftable automatic AWD |
the rear seats are great for kids, but not for adults. not lots of leg room. head and shoulder room is fine. see full Infiniti FX review |