2008 Audi A8 vs. 2008 BMW 645
To start off, both 2008 Audi A8 and 2008 BMW 645 were released in the same year (2008). Therefore the support and the availability on parts for both vehicles should be relatively similar. At 4,398 cc (8 cylinders), 2008 BMW 645 is equipped with a bigger engine. In terms of performance, 2008 BMW 645 (328 HP @ 6100 RPM) has 57 more horse power than 2008 Audi A8. (271 HP @ 3750 RPM) In normal driving conditions, 2008 BMW 645 should accelerate faster than 2008 Audi A8. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi A8 weights approximately 129 kg more than 2008 BMW 645.
Because 2008 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2008 BMW 645. In wet, icy, snow, or gravel driving conditions, 2008 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, 2008 Audi A8 (650 Nm @ 1800 RPM) has 200 more torque (in Nm) than 2008 BMW 645. (450 Nm @ 3600 RPM). This means 2008 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2008 BMW 645.
Compare all specifications:
| 2008 Audi A8 | 2008 BMW 645 | |
| Make | Audi | BMW |
| Model | A8 | 645 |
| Year Released | 2008 | 2008 |
| 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 | 650 Nm | 450 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Bore Size | 81 mm | 92 mm |
| Engine Stroke Size | 95.5 mm | 82.7 mm |
| Engine Compression Ratio | 18.0:1 | 10.0:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 6.8 seconds | 6.4 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 | 1944 kg | 1815 kg |
| Vehicle Length | 5190 mm | 4830 mm |
| Vehicle Width | 1900 mm | 1860 mm |
| Vehicle Height | 1460 mm | 1380 mm |
| Wheelbase Size | 3080 mm | 2790 mm |
| Fuel Consumption Overall | 9.6 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
