2011 Audi S8 vs. 2004 BMW 645
To start off, 2011 Audi S8 is newer by 7 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 5,204 cc (10 cylinders), 2011 Audi S8 is equipped with a bigger engine. In terms of performance, 2011 Audi S8 (450 HP @ 7000 RPM) has 122 more horse power than 2004 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2011 Audi S8 should accelerate faster than 2004 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 640 kg more than 2011 Audi S8.
Because 2011 Audi S8 is all wheel drive (AWD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 2011 Audi S8 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, 2011 Audi S8 (540 Nm @ 3500 RPM) has 89 more torque (in Nm) than 2004 BMW 645. (451 Nm @ 3600 RPM). This means 2011 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 2004 BMW 645.
Compare all specifications:
| 2011 Audi S8 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | S8 | 645 |
| Year Released | 2011 | 2004 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 5204 cc | 4398 cc |
| Engine Cylinders | 10 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 450 HP | 328 HP |
| Engine RPM | 7000 RPM | 6100 RPM |
| Torque | 540 Nm | 451 Nm |
| Torque RPM | 3500 RPM | 3600 RPM |
| Fuel Type | Gasoline | Gasoline - Premium |
| Acceleration 0-100mph | 5.1 seconds | 6.1 seconds |
| Drive Type | AWD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1175 kg | 1815 kg |
| Vehicle Length | 5070 mm | 4830 mm |
| Vehicle Width | 1900 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2950 mm | 2790 mm |
| Fuel Consumption Overall | 15.8 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
