2005 BMW 645 vs. 2013 BMW X6
To start off, 2013 BMW X6 is newer by 8 year(s). Which means there will be less support and parts availability for 2005 BMW 645. In addition, the cost of maintenance, including insurance, on 2005 BMW 645 would be higher. At 4,395 cc (8 cylinders), 2013 BMW X6 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 30 more horse power than 2013 BMW X6. (296 HP @ 5500 RPM). In normal driving conditions, 2005 BMW 645 should accelerate faster than 2013 BMW X6. With that said, vehicle weight also plays an important factor in acceleration. 2013 BMW X6 weights approximately 475 kg more than 2005 BMW 645.
Because 2013 BMW X6 is all wheel drive (AWD), it will have significant more traction and grip than 2005 BMW 645. In wet, icy, snow, or gravel driving conditions, 2013 BMW X6 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, 2013 BMW X6 (610 Nm @ 4500 RPM) has 163 more torque (in Nm) than 2005 BMW 645. (447 Nm @ 3600 RPM). This means 2013 BMW X6 will have an easier job in driving up hills or pulling heavy equipment than 2005 BMW 645.
Compare all specifications:
| 2005 BMW 645 | 2013 BMW X6 | |
| Make | BMW | BMW |
| Model | 645 | X6 |
| Year Released | 2005 | 2013 |
| Body Type | Convertible | Crossover |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 4395 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 326 HP | 296 HP |
| Engine RPM | 6100 RPM | 5500 RPM |
| Torque | 447 Nm | 610 Nm |
| Torque RPM | 3600 RPM | 4500 RPM |
| Engine Bore Size | 92 mm | 89 mm |
| Engine Stroke Size | 83 mm | 88 mm |
| Engine Compression Ratio | 10.5:1 | 10.0 : 1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Rear | AWD |
| Transmission Type | Automatic | 8-speed automatic |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1895 kg | 2370 kg |
| Vehicle Length | 4830 mm | 4877 mm |
| Vehicle Width | 1860 mm | 2195 mm |
| Vehicle Height | 1380 mm | 1690 mm |
| Wheelbase Size | 2890 mm | 2933 mm |
| Fuel Consumption Highway | 10.2 L/100km | 9.9 L/100km |
| Fuel Consumption City | 15.7 L/100km | 15.3 L/100km |
| Fuel Tank Capacity | 70 L | 85 L |
