| Model Year | 2015 | 2018 | |
| Model | Audi A8 / S8 | Tesla Model X | |
| Engine |  6.3L W12 DOHC-4v 500 hp@6200 463 lb-ft@4750  | 
						 Electric 600 hp 713 lb-ft  | 
						|
| Transmission | 8-speed shiftable automatic | 1-speed automatic | |
| Drivetrain | AWD | AWD | |
| Body | 4dr Sedan, ext. | 4dr SUV | |
| Difference | |||
| Wheelbase | 122.9 in | 116.7 in | 6.2 in | 
| Length | 207.4 in | 198.3 in | 9.1 in | 
| Width | 76.7 in | 81.5 in | -4.8 in | 
| Height | 57.9 in | 66.3 in | -8.4 in | 
| Curb Weight | 4806 lb. | 5381 lb. | -575 lb. | 
| Fuel Capacity | 21.7 gal. | 0.0 gal. | 21.7 gal. | 
| Headroom, Row 1 | 37.2 in | 41.7 in | -4.5 in | 
| Shoulder Room, Row 1 | 59.1 in | 60.7 in | -1.6 in | 
| Hip Room, Row 1 | 0.0 in | 55.6 in | -55.6 in | 
| Legroom, Row 1 | 41.4 in | 41.2 in | 0.2 in | 
| Headroom, Row 2 | 39.1 in | 40.9 in | -1.8 in | 
| Shoulder Room, Row 2 | 57.8 in | 56.8 in | 1 in | 
| Hip Room, Row 2 | 0.0 in | 59.0 in | -59 in | 
| Legroom, Row 2 | 42.9 in | 38.4 in | 4.5 in | 
| Headroom, Row 3 | 0.0 in | 37.1 in | -37.1 in | 
| Shoulder Room, Row 3 | 0.0 in | 40.0 in | -40 in | 
| Hip Room, Row 3 | 0.0 in | 38.5 in | -38.5 in | 
| Legroom, Row 3 | 0.0 in | 32.7 in | -32.7 in | 
| Total Legroom | 84.3 in (over 2 rows) | 112.3 in (over 3 rows) | -28 in | 
| Cargo Volume | 14.2 ft3 | 0.0 | 14.2 ft3 | 
None of our members have yet commented on the seat room and comfort of the 2015 Audi A8 / S8.
None of our members have yet commented on the seat room and comfort of the 2018 Tesla Model X.