2005 Audi A4 vs. 2007 Audi A8
To start off, 2007 Audi A8 is newer by 2 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 3,123 cc (6 cylinders), 2007 Audi A8 is equipped with a bigger engine. In terms of performance, 2007 Audi A8 (256 HP) has 156 more horse power than 2005 Audi A4. (100 HP) In normal driving conditions, 2007 Audi A8 should accelerate faster than 2005 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A8 weights approximately 430 kg more than 2005 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, 2007 Audi A8 (330 Nm @ 3250 RPM) has 80 more torque (in Nm) than 2005 Audi A4. (250 Nm @ 1900 RPM). This means 2007 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Audi A4. 2007 Audi A8 has automatic transmission and 2005 Audi A4 has manual transmission. 2005 Audi A4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 Audi A8 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2005 Audi A4 | 2007 Audi A8 | |
| Make | Audi | Audi |
| Model | A4 | A8 |
| Year Released | 2005 | 2007 |
| Body Type | Station Wagon | Sedan |
| Engine Position | Front | Front |
| Engine Size | 1894 cc | 3123 cc |
| Engine Cylinders | 4 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Valves per Cylinder | 2 valves | 5 valves |
| Horse Power | 100 HP | 256 HP |
| Torque | 250 Nm | 330 Nm |
| Torque RPM | 1900 RPM | 3250 RPM |
| Engine Bore Size | 79.5 mm | 84.5 mm |
| Engine Stroke Size | 95.5 mm | 92.8 mm |
| Engine Compression Ratio | 19.0:1 | 13.0:1 |
| Fuel Type | Diesel | Gasoline - Premium |
| Top Speed | 191 km/hour | 250 km/hour |
| Acceleration 0-100mph | 12.5 seconds | 8 seconds |
| Drive Type | Front | Front |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1450 kg | 1880 kg |
| Vehicle Length | 4550 mm | 5060 mm |
| Vehicle Width | 1780 mm | 1900 mm |
| Vehicle Height | 1430 mm | 1450 mm |
| Wheelbase Size | 2660 mm | 2950 mm |
| Fuel Consumption Overall | 5.7 L/100km | 9.8 L/100km |
| Fuel Tank Capacity | 70 L | 90 L |
