2007 Audi A8 vs. 2005 BMW 645
To start off, 2007 Audi A8 is newer by 2 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 4,390 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (338 HP) has 82 more horse power than 2007 Audi A8. (256 HP) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2007 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A8 weights approximately 165 kg more than 2005 BMW 645.
Because 2005 BMW 645 is rear wheel drive (RWD), it offers better handling in dry conditions; in addition, if you are looking to drift, it will be much easier to do with 2005 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2007 Audi A8, being front wheel drive (FWD), will offer much better control with better grip. 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, 2005 BMW 645 (439 Nm @ 3600 RPM) has 109 more torque (in Nm) than 2007 Audi A8. (330 Nm @ 3250 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A8.
Compare all specifications:
| 2007 Audi A8 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | A8 | 645 |
| Year Released | 2007 | 2005 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3123 cc | 4390 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 256 HP | 338 HP |
| Torque | 330 Nm | 439 Nm |
| Torque RPM | 3250 RPM | 3600 RPM |
| Engine Bore Size | 84.5 mm | 92 mm |
| Engine Stroke Size | 92.8 mm | 83 mm |
| Engine Compression Ratio | 13.0:1 | 10.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8 seconds | 5.6 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1880 kg | 1715 kg |
| Vehicle Length | 5060 mm | 4830 mm |
| Vehicle Width | 1900 mm | 1860 mm |
| Vehicle Height | 1450 mm | 1380 mm |
| Wheelbase Size | 2950 mm | 2790 mm |
| Fuel Consumption Overall | 9.8 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
