2009 Audi A8 vs. 2007 Audi A4
To start off, 2009 Audi A8 is newer by 2 year(s). Which means there will be less support and parts availability for 2007 Audi A4. In addition, the cost of maintenance, including insurance, on 2007 Audi A4 would be higher. At 5,204 cc (10 cylinders), 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (444 HP @ 7000 RPM) has 192 more horse power than 2007 Audi A4. (252 HP @ 5100 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2007 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2009 Audi A8 weights approximately 200 kg more than 2007 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, 2009 Audi A8 (540 Nm @ 3500 RPM) has 210 more torque (in Nm) than 2007 Audi A4. (330 Nm @ 3250 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A4.
Compare all specifications:
| 2009 Audi A8 | 2007 Audi A4 | |
| Make | Audi | Audi |
| Model | A8 | A4 |
| Year Released | 2009 | 2007 |
| Body Type | Sedan | Convertible |
| Engine Position | Front | Front |
| Engine Size | 5204 cc | 3121 cc |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 444 HP | 252 HP |
| Engine RPM | 7000 RPM | 5100 RPM |
| Torque | 540 Nm | 330 Nm |
| Torque RPM | 3500 RPM | 3250 RPM |
| Engine Bore Size | 84.5 mm | 84.5 mm |
| Engine Stroke Size | 92.8 mm | 92.8 mm |
| Engine Compression Ratio | 12.5:1 | 12.5:1 |
| Fuel Type | Gasoline - Premium | Gasoline - Premium |
| Top Speed | 250 km/hour | 250 km/hour |
| Acceleration 0-100mph | 5.1 seconds | 7.4 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1940 kg | 1740 kg |
| Vehicle Length | 5070 mm | 4580 mm |
| Vehicle Width | 1900 mm | 1400 mm |
| Vehicle Height | 1430 mm | 1780 mm |
| Wheelbase Size | 2950 mm | 2660 mm |
| Fuel Consumption Overall | 15.8 L/100km | 11.1 L/100km |
| Fuel Tank Capacity | 90 L | 70 L |
