2003 BMW 645 vs. 2007 Mercedes-Benz G
To start off, 2007 Mercedes-Benz G is newer by 4 year(s). Which means there will be less support and parts availability for 2003 BMW 645. In addition, the cost of maintenance, including insurance, on 2003 BMW 645 would be higher. At 5,439 cc (8 cylinders), 2007 Mercedes-Benz G is equipped with a bigger engine. In terms of performance, 2007 Mercedes-Benz G (493 HP @ 6100 RPM) has 172 more horse power than 2003 BMW 645. (321 HP @ 6100 RPM) In normal driving conditions, 2007 Mercedes-Benz G should accelerate faster than 2003 BMW 645.
Because 2007 Mercedes-Benz G is four wheel drive (4WD), it will have significant more traction and grip than 2003 BMW 645. In wet, icy, snow, or gravel driving conditions, 2007 Mercedes-Benz G 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 Mercedes-Benz G (700 Nm @ 2750 RPM) has 250 more torque (in Nm) than 2003 BMW 645. (450 Nm @ 3600 RPM). This means 2007 Mercedes-Benz G will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW 645.
Compare all specifications:
| 2003 BMW 645 | 2007 Mercedes-Benz G | |
| Make | BMW | Mercedes-Benz |
| Model | 645 | G |
| Year Released | 2003 | 2007 |
| Body Type | Convertible | SUV |
| Engine Position | Front | Front |
| Engine Size | 4398 cc | 5439 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 3 valves |
| Horse Power | 321 HP | 493 HP |
| Engine RPM | 6100 RPM | 6100 RPM |
| Torque | 450 Nm | 700 Nm |
| Torque RPM | 3600 RPM | 2750 RPM |
| Engine Bore Size | 92 mm | 97 mm |
| Engine Stroke Size | 82.7 mm | 92 mm |
| Engine Compression Ratio | 10.5:1 | 9.0:1 |
| Drive Type | Rear | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Length | 4830 mm | 4720 mm |
| Vehicle Width | 1860 mm | 1870 mm |
| Vehicle Height | 1380 mm | 1980 mm |
| Wheelbase Size | 2790 mm | 2860 mm |
| Fuel Consumption | 8.5 L/100km | 16.8 L/100km |
| Fuel Consumption City | 16.8 L/100km | 19.6 L/100km |
| Fuel Consumption Overall | 11.5 L/100km | 18.1 L/100km |
| Fuel Tank Capacity | 70 L | 96 L |
