2001 Audi A8 vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 3 year(s). Which means there will be less support and parts availability for 2001 Audi A8. In addition, the cost of maintenance, including insurance, on 2001 Audi A8 would be higher. At 4,398 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (328 HP @ 6100 RPM) has 57 more horse power than 2001 Audi A8. (271 HP @ 3750 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2001 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2001 Audi A8 weights approximately 45 kg more than 2004 BMW 645.
Because 2001 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 2001 Audi A8 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, 2004 BMW 645 (451 Nm @ 3600 RPM) has 131 more torque (in Nm) than 2001 Audi A8. (320 Nm @ 1800 RPM). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2001 Audi A8.
Compare all specifications:
| 2001 Audi A8 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A8 | 645 |
| Year Released | 2001 | 2004 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 3936 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 271 HP | 328 HP |
| Engine RPM | 3750 RPM | 6100 RPM |
| Torque | 320 Nm | 451 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Bore Size | 81 mm | 92 mm |
| Engine Stroke Size | 95.5 mm | 82.7 mm |
| Fuel Type | Diesel | Gasoline - Premium |
| Acceleration 0-100mph | 6.7 seconds | 6.1 seconds |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1860 kg | 1815 kg |
| Vehicle Length | 5060 mm | 4830 mm |
| Vehicle Width | 1900 mm | 1860 mm |
| Vehicle Height | 1450 mm | 1380 mm |
| Wheelbase Size | 2470 mm | 2790 mm |
| Fuel Consumption Overall | 9.7 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
