| Model Year | 2020 | 2015 | |
| Model | Audi A3 / S3 / RS3 | Mercedes-Benz C-Class | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 4dr Sedan | 4dr Sedan | |
| Difference | |||
| Wheelbase | 103.8 in | 111.8 in | -8 in |
| Length | 175.4 in | 184.5 in | -9.1 in |
| Width | 70.7 in | 71.3 in | -0.6 in |
| Height | 55.7 in | 56.8 in | -1.1 in |
| Curb Weight | 3197 lb. | 3417 lb. | -220 lb. |
| Fuel Capacity | 13.2 gal. | 18.0 gal. | -4.8 gal. |
| Headroom, Row 1 | 36.5 in | 37.1 in | -0.6 in |
| Shoulder Room, Row 1 | 54.8 in | 55.3 in | -0.5 in |
| Legroom, Row 1 | 41.2 in | 41.7 in | -0.5 in |
| Headroom, Row 2 | 36.1 in | 37.1 in | -1 in |
| Shoulder Room, Row 2 | 53.0 in | 55.0 in | -2 in |
| Legroom, Row 2 | 35.1 in | 35.2 in | -0.1 in |
| Total Legroom | 76.3 in (over 2 rows) | 76.9 in (over 2 rows) | -0.6 in |
| Cargo Volume | 12.3 ft3 | 12.6 ft3 | -0.3 ft3 |
None of our members have yet commented on the seat room and comfort of the 2020 Audi A3 / S3 / RS3.
None of our members have yet commented on the seat room and comfort of the 2015 Mercedes-Benz C-Class.