2009 BMW 730 vs. 2004 BMW 645
To start off, 2009 BMW 730 is newer by 5 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 80 more horse power than 2009 BMW 730. (242 HP @ 4000 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2009 BMW 730. With that said, vehicle weight also plays an important factor in acceleration. 2009 BMW 730 weights approximately 150 kg more than 2004 BMW 645.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. 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, 2009 BMW 730 (540 Nm) has 93 more torque (in Nm) than 2004 BMW 645. (447 Nm). This means 2009 BMW 730 will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW 645.
Compare all specifications:
| 2009 BMW 730 | 2004 BMW 645 | |
| Make | BMW | BMW |
| Model | 730 | 645 |
| Year Released | 2009 | 2004 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2993 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 242 HP | 322 HP |
| Engine RPM | 4000 RPM | 7400 RPM |
| Torque | 540 Nm | 447 Nm |
| Engine Compression Ratio | 16.5:1 | 10.5:1 |
| Drive Type | Rear | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1865 kg | 1715 kg |
| Vehicle Length | 5080 mm | 4840 mm |
| Vehicle Width | 1910 mm | 1860 mm |
| Vehicle Height | 1490 mm | 1380 mm |
| Wheelbase Size | 3080 mm | 2790 mm |
| Fuel Consumption Overall | 7.2 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 80 L | 70 L |
