2005 Audi A6 vs. 2006 BMW 645
To start off, 2006 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2005 Audi A6. In addition, the cost of maintenance, including insurance, on 2005 Audi A6 would be higher. At 4,398 cc (8 cylinders), 2006 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 Audi A6 (335 HP @ 4000 RPM) has 7 more horse power than 2006 BMW 645. (328 HP @ 6100 RPM). In normal driving conditions, 2005 Audi A6 should accelerate faster than 2006 BMW 645. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi A6 weights approximately 70 kg more than 2006 BMW 645. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
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, 2005 Audi A6, 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) has 30 more torque (in Nm) than 2005 Audi A6. (420 Nm). This means 2006 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi A6.
Compare all specifications:
| 2005 Audi A6 | 2006 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2005 | 2006 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4163 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 335 HP | 328 HP |
| Engine RPM | 4000 RPM | 6100 RPM |
| Torque | 420 Nm | 450 Nm |
| Engine Compression Ratio | 11.0:1 | 10.0:1 |
| Drive Type | Front | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1880 kg | 1810 kg |
| Vehicle Length | 4920 mm | 4830 mm |
| Vehicle Width | 2020 mm | 1860 mm |
| Vehicle Height | 1460 mm | 1380 mm |
| Wheelbase Size | 2660 mm | 2790 mm |
| Fuel Consumption Overall | 11.8 L/100km | 13.3 L/100km |
| Fuel Tank Capacity | 80 L | 70 L |
