2004 Audi A6 vs. 2005 BMW 645
To start off, 2005 BMW 645 is newer by 1 year(s). Which means there will be less support and parts availability for 2004 Audi A6. In addition, the cost of maintenance, including insurance, on 2004 Audi A6 would be higher. At 4,392 cc (8 cylinders), 2005 BMW 645 is equipped with a bigger engine. In terms of performance, 2005 BMW 645 (326 HP @ 6100 RPM) has 148 more horse power than 2004 Audi A6. (178 HP @ 3300 RPM) In normal driving conditions, 2005 BMW 645 should accelerate faster than 2004 Audi A6. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW 645 weights approximately 200 kg more than 2004 Audi A6. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2005 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 2005 BMW 645. However, in wet, icy, snow, or gravel driving conditions, 2004 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, 2005 BMW 645 (447 Nm @ 3600 RPM) has 77 more torque (in Nm) than 2004 Audi A6. (370 Nm @ 1400 RPM). This means 2005 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2004 Audi A6. 2005 BMW 645 has automatic transmission and 2004 Audi A6 has manual transmission. 2004 Audi A6 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2005 BMW 645 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2004 Audi A6 | 2005 BMW 645 | |
| Make | Audi | BMW |
| Model | A6 | 645 |
| Year Released | 2004 | 2005 |
| Body Type | Station Wagon | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2698 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 178 HP | 326 HP |
| Engine RPM | 3300 RPM | 6100 RPM |
| Torque | 370 Nm | 447 Nm |
| Torque RPM | 1400 RPM | 3600 RPM |
| Engine Bore Size | 83 mm | 92 mm |
| Engine Stroke Size | 83.1 mm | 83 mm |
| Engine Compression Ratio | 17.0:1 | 10.5:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 225 km/hour | 250 km/hour |
| Acceleration 0-100mph | 8.3 seconds | 6.1 seconds |
| Drive Type | Front | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1695 kg | 1895 kg |
| Vehicle Length | 4940 mm | 4830 mm |
| Vehicle Width | 1860 mm | 1860 mm |
| Vehicle Height | 1470 mm | 1380 mm |
| Wheelbase Size | 2950 mm | 2890 mm |
| Fuel Consumption | 5.4 L/100km | 10.2 L/100km |
| Fuel Consumption City | 9.8 L/100km | 15.7 L/100km |
| Fuel Consumption Overall | 7 L/100km | 12.8 L/100km |
| Fuel Tank Capacity | 70 L | 70 L |
