2008 Audi A8 vs. 2009 Audi A4
To start off, 2009 Audi A4 is newer by 1 year(s). Which means there will be less support and parts availability for 2008 Audi A8. In addition, the cost of maintenance, including insurance, on 2008 Audi A8 would be higher. At 2,976 cc (6 cylinders), 2008 Audi A8 is equipped with a bigger engine. In terms of performance, 2008 Audi A8 (217 HP @ 6300 RPM) has 59 more horse power than 2009 Audi A4. (158 HP @ 4500 RPM). In normal driving conditions, 2008 Audi A8 should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2008 Audi A8 weights approximately 775 kg more than 2009 Audi A4. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are front wheel drive (FWD). Which offers better traction when its slippery than rear wheel drive vehicles. 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 (300 Nm @ 8200 RPM) has 50 more torque (in Nm) than 2009 Audi A4. (250 Nm @ 1500 RPM). This means 2008 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi A4.
Compare all specifications:
| 2008 Audi A8 | 2009 Audi A4 | |
| Make | Audi | Audi |
| Model | A8 | A4 |
| Year Released | 2008 | 2009 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2976 cc | 1798 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 217 HP | 158 HP |
| Engine RPM | 6300 RPM | 4500 RPM |
| Torque | 300 Nm | 250 Nm |
| Torque RPM | 8200 RPM | 1500 RPM |
| Engine Bore Size | 82.5 mm | 82.5 mm |
| Engine Stroke Size | 92.8 mm | 84.1 mm |
| Engine Compression Ratio | 11.0:1 | 9.6:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Top Speed | 242 km/hour | 225 km/hour |
| Acceleration 0-100mph | 8.3 seconds | 8.6 seconds |
| Drive Type | Front | Front |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1670 kg | 895 kg |
| Vehicle Length | 5190 mm | 4710 mm |
| Vehicle Width | 1900 mm | 2010 mm |
| Vehicle Height | 1460 mm | 1430 mm |
| Wheelbase Size | 3080 mm | 2810 mm |
| Fuel Consumption Overall | 9.6 L/100km | 7.1 L/100km |
| Fuel Tank Capacity | 90 L | 65 L |
