2007 Audi A8 vs. 2009 Audi A4
To start off, 2009 Audi A4 is newer by 2 year(s). Which means there will be less support and parts availability for 2007 Audi A8. In addition, the cost of maintenance, including insurance, on 2007 Audi A8 would be higher. At 5,997 cc, 2007 Audi A8 is equipped with a bigger engine. In terms of performance, 2007 Audi A8 (444 HP @ 6200 RPM) has 233 more horse power than 2009 Audi A4. (211 HP @ 4300 RPM). In normal driving conditions, 2007 Audi A8 should accelerate faster than 2009 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A8 weights approximately 1065 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 four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or 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, 2007 Audi A8 (580 Nm @ 4000 RPM) has 230 more torque (in Nm) than 2009 Audi A4. (350 Nm @ 1500 RPM). This means 2007 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2009 Audi A4.
Compare all specifications:
| 2007 Audi A8 | 2009 Audi A4 | |
| Make | Audi | Audi |
| Model | A8 | A4 |
| Year Released | 2007 | 2009 |
| Body Type | Sedan | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 5997 cc | 1984 cc |
| Engine Type | W | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 444 HP | 211 HP |
| Engine RPM | 6200 RPM | 4300 RPM |
| Torque | 580 Nm | 350 Nm |
| Torque RPM | 4000 RPM | 1500 RPM |
| Engine Bore Size | 84 mm | 82.5 mm |
| Engine Stroke Size | 90.2 mm | 92.8 mm |
| Engine Compression Ratio | 11.0:1 | 17.0:1 |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1995 kg | 930 kg |
| Vehicle Length | 5070 mm | 4710 mm |
| Vehicle Width | 1900 mm | 1840 mm |
| Vehicle Height | 1460 mm | 1440 mm |
| Wheelbase Size | 3080 mm | 2820 mm |
| Fuel Consumption Overall | 13.8 L/100km | 10.2 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
