| Model Year | 2013 | 2010 | |
| Model | BMW Z4 | Mercedes-Benz R-Class | |
| Engine | |||
| Transmission | |||
| Drivetrain | |||
| Body | 2dr Hardtop conv. | 4dr SUV | |
| Difference | |||
| Wheelbase | 98.3 in | 126.6 in | -28.3 in |
| Length | 166.9 in | 203.0 in | -36.1 in |
| Width | 70.5 in | 75.7 in | -5.2 in |
| Height | 50.8 in | 65.4 in | -14.6 in |
| Curb Weight | 3263 lb. | 4829 lb. | -1566 lb. |
| Fuel Capacity | 14.5 gal. | 25.1 gal. | -10.6 gal. |
| Headroom, Row 1 | 39.1 in | 39.8 in | -0.7 in |
| Shoulder Room, Row 1 | 53.3 in | 60.3 in | -7 in |
| Legroom, Row 1 | 42.2 in | 39.8 in | 2.4 in |
| Headroom, Row 2 | 0.0 in | 40.4 in | -40.4 in |
| Shoulder Room, Row 2 | 0.0 in | 59.6 in | -59.6 in |
| Legroom, Row 2 | 0.0 in | 36.2 in | -36.2 in |
| Headroom, Row 3 | 0.0 in | 37.2 in | -37.2 in |
| Shoulder Room, Row 3 | 0.0 in | 52.8 in | -52.8 in |
| Legroom, Row 3 | 0.0 in | 32.4 in | -32.4 in |
| Total Legroom | 42.2 in (over 1 rows) | 108.4 in (over 3 rows) | -66.2 in |
| Cargo Volume, Minimum | 10.9 ft3 | 15.3 ft3 | -4.4 ft3 |
| Cargo Volume, Behind R2 | 10.9 | 42.2 ft3 | -31.3 |
| Cargo Volume, Maximum | 10.9 ft3 | 85.0 ft3 | -74.1 ft3 |
None of our members have yet commented on the seat room and comfort of the 2013 BMW Z4.
| 2010 Mercedes-Benz R-Class Seat Room and Comfort: Cons | ||
| Year | Body/Powertrain | Comment |
| 2009 | 4dr SUV 268-horsepower 3.5L V6 7-speed shiftable automatic AWD |
Three different lumbar pumps...don't seem to be very different in what is inflated. see full Mercedes-Benz R-Class review |