2009 Audi S8 vs. 2005 Cadillac STS
To start off, 2009 Audi S8 is newer by 4 year(s). Which means there will be less support and parts availability for 2005 Cadillac STS. In addition, the cost of maintenance, including insurance, on 2005 Cadillac STS would be higher. At 5,204 cc (10 cylinders), 2009 Audi S8 is equipped with a bigger engine. In terms of performance, 2009 Audi S8 (450 HP @ 7000 RPM) has 129 more horse power than 2005 Cadillac STS. (321 HP @ 6400 RPM). In normal driving conditions, 2009 Audi S8 should accelerate faster than 2005 Cadillac STS. With that said, vehicle weight also plays an important factor in acceleration. 2005 Cadillac STS weights approximately 642 kg more than 2009 Audi S8.
Because 2009 Audi S8 is all wheel drive (AWD), it will have significant more traction and grip than 2005 Cadillac STS. In wet, icy, snow, or gravel driving conditions, 2009 Audi S8 will offer significantly more control. 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 S8 (540 Nm @ 3500 RPM) has 113 more torque (in Nm) than 2005 Cadillac STS. (427 Nm @ 4400 RPM). This means 2009 Audi S8 will have an easier job in driving up hills or pulling heavy equipment than 2005 Cadillac STS.
Compare all specifications:
| 2009 Audi S8 | 2005 Cadillac STS | |
| Make | Audi | Cadillac |
| Model | S8 | STS |
| Year Released | 2009 | 2005 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 5204 cc | 4565 cc |
| Engine Cylinders | 10 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 450 HP | 321 HP |
| Engine RPM | 7000 RPM | 6400 RPM |
| Torque | 540 Nm | 427 Nm |
| Torque RPM | 3500 RPM | 4400 RPM |
| Engine Compression Ratio | 12.5:1 | 10.5:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Acceleration 0-100mph | 5.1 seconds | 6.2 seconds |
| Drive Type | AWD | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1175 kg | 1817 kg |
| Vehicle Length | 5070 mm | 4990 mm |
| Vehicle Width | 1900 mm | 1850 mm |
| Vehicle Height | 1430 mm | 1470 mm |
| Wheelbase Size | 2950 mm | 2960 mm |
| Fuel Consumption Highway | 12.4 L/100km | 9.1 L/100km |
| Fuel Consumption City | 18.2 L/100km | 13.8 L/100km |
| Fuel Consumption Overall | 15.8 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 90 L | 66 L |
