2008 Audi A4 vs. 2006 BMW 645
To start off, 2008 Audi A4 is newer by 2 year(s). Which means there will be less support and parts availability for 2006 BMW 645. In addition, the cost of maintenance, including insurance, on 2006 BMW 645 would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. With that said, vehicle weight also plays an important factor in acceleration. 2006 BMW 645 weights approximately 185 kg more than 2008 Audi A4.
Because 2006 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 2006 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2008 Audi A4, 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, 2006 BMW 645 (450 Nm @ 3600 RPM) has 170 more torque (in Nm) than 2008 Audi A4. (280 Nm @ 1800 RPM). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2008 Audi A4.
Compare all specifications:
| 2008 Audi A4 | 2006 BMW 645 | |
| Make | Audi | BMW |
| Model | A4 | 645 |
| Year Released | 2008 | 2006 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 1983 cc | 4398 cc |
| Engine Cylinders | 4 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 0 HP | 328 HP |
| Torque | 280 Nm | 450 Nm |
| Torque RPM | 1800 RPM | 3600 RPM |
| Engine Bore Size | 82.5 mm | 92 mm |
| Engine Stroke Size | 92.8 mm | 82.7 mm |
| Engine Compression Ratio | 10.5:1 | 10.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 238 km/hour | 250 km/hour |
| Acceleration 0-100mph | 7.9 seconds | 6.4 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1630 kg | 1815 kg |
| Vehicle Length | 4580 mm | 4830 mm |
| Vehicle Width | 1780 mm | 1860 mm |
| Vehicle Height | 1400 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2790 mm |
| Fuel Consumption Overall | 8.3 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
