2006 BMW Z4 vs. 2007 Toyota Sienna
To start off, 2007 Toyota Sienna is newer by 1 year(s). Which means there will be less support and parts availability for 2006 BMW Z4. In addition, the cost of maintenance, including insurance, on 2006 BMW Z4 would be higher. At 3,455 cc (6 cylinders), 2007 Toyota Sienna is equipped with a bigger engine. In terms of performance, 2007 Toyota Sienna (266 HP @ 6200 RPM) has 77 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM) In normal driving conditions, 2007 Toyota Sienna should accelerate faster than 2006 BMW Z4.
Because 2007 Toyota Sienna is four wheel drive (4WD), it will have significant more traction and grip than 2006 BMW Z4. In wet, icy, snow, or gravel driving conditions, 2007 Toyota Sienna will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2007 Toyota Sienna (332 Nm @ 4700 RPM) has 87 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2007 Toyota Sienna will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4. 2007 Toyota Sienna has automatic transmission and 2006 BMW Z4 has manual transmission. 2006 BMW Z4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 Toyota Sienna will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2006 BMW Z4 | 2007 Toyota Sienna | |
| Make | BMW | Toyota |
| Model | Z4 | Sienna |
| Year Released | 2006 | 2007 |
| Body Type | Convertible | Minivan |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 3455 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 266 HP |
| Engine RPM | 6000 RPM | 6200 RPM |
| Torque | 245 Nm | 332 Nm |
| Torque RPM | 3500 RPM | 4700 RPM |
| Engine Compression Ratio | 11.0:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 2 seats | 7 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Length | 4100 mm | 5110 mm |
| Vehicle Width | 1790 mm | 1970 mm |
| Vehicle Height | 1310 mm | 1760 mm |
| Wheelbase Size | 2500 mm | 3040 mm |
| Fuel Consumption Overall | 9 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 55 L | 76 L |
