2005 Audi A4 vs. 2008 Audi A8
To start off, 2008 Audi A8 is newer by 3 year(s). Which means there will be less support and parts availability for 2005 Audi A4. In addition, the cost of maintenance, including insurance, on 2005 Audi A4 would be higher. At 5,998 cc, 2008 Audi A8 is equipped with a bigger engine. In terms of performance, 2008 Audi A8 (450 HP @ 6200 RPM) has 230 more horse power than 2005 Audi A4. (220 HP @ 6300 RPM) In normal driving conditions, 2008 Audi A8 should accelerate faster than 2005 Audi A4.
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, 2008 Audi A8 (580 Nm @ 4000 RPM) has 280 more torque (in Nm) than 2005 Audi A4. (300 Nm @ 3200 RPM). This means 2008 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi A4.
Compare all specifications:
| 2005 Audi A4 | 2008 Audi A8 | |
| Make | Audi | Audi |
| Model | A4 | A8 |
| Year Released | 2005 | 2008 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2983 cc | 5998 cc |
| Engine Type | V | W |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 220 HP | 450 HP |
| Engine RPM | 6300 RPM | 6200 RPM |
| Torque | 300 Nm | 580 Nm |
| Torque RPM | 3200 RPM | 4000 RPM |
| Engine Bore Size | 83 mm | 84 mm |
| Engine Stroke Size | 93 mm | 90.2 mm |
| Drive Type | 4WD | 4WD |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Length | 4550 mm | 5200 mm |
| Vehicle Width | 1770 mm | 1900 mm |
| Vehicle Height | 1430 mm | 1460 mm |
| Wheelbase Size | 2660 mm | 3080 mm |
| Fuel Consumption | 9.6 L/100km | 11.2 L/100km |
| Fuel Consumption City | 13.2 L/100km | 15.7 L/100km |
| Fuel Consumption Overall | 11 L/100km | 13.8 L/100km |
| Fuel Tank Capacity | 66 L | 90 L |
