Comparison Mercedes-Benz S-class (W221, facelift 2009) S 450 V8 (340 Hp) 4MATIC G-TRONIC & Audi A4 Avant (B5, Typ 8D) 2.4 V6 30V (165 Hp) Tiptronic
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| Brand: | Mercedes-Benz | Audi |
| Model: | S-class | A4 |
| Generation: | S-class (W221, facelift 2009) | A4 Avant (B5, Typ 8D) |
| Engine / modification: | S 450 V8 (340 Hp) 4MATIC G-TRONIC | 2.4 V6 30V (165 Hp) Tiptronic |
| Production start: | 2009 year | 1997 year |
| Production end: | 2010 year | 1999 year |
| Coupe type: | Sedan | Combi |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 16.3-16.4 l/100 km | 14.9 l/100 km |
| Fuel consumption / economy - extra urban: | 7.9-8 l/100 km | 7.5 l/100 km |
| Fuel consumption / economy - combined: | 11-11.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | |
| Fuel tank volume: | 90 l | 62 l |
| CO2 emissions: | 256-258 g/km | |
| Power: | 340 hp | 165 hp |
| Max power in: | 6000 rpm. | 6000 rpm. |
| Maximum speed: | 250 km/h | 216 km/h |
| Acceleration from 0 to 100 km/h: | 5.9 sec | 10.1 sec |
| Torque: | 460 Nm @ 2700-5000 rpm. | 230 Nm/3200 rpm. |
| Model Engine: | M 273.924 | |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4663 cm3 | 2393 cm3 |
| Engine oil capacity: | 8.5 l | |
| Fuel System: | Multi-point injection | Multi-point injection |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | DOHC | |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 5 |
| Compression ratio: | 10.5 | 10.5 |
| Piston Stroke: | 77.4 mm | |
| Cylinder Bore: | 81 mm | |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | 7G-TRONIC | 5 Tiptronic |
| Length: | 5096 mm | 4479 mm |
| Width: | 1871 mm | 1733 mm |
| Width including mirrors: | 2120 mm | |
| Height: | 1479 mm | 1417 mm |
| Wheelbase: | 3035 mm | 2622 mm |
| Front track: | 1600 mm | 1498 mm |
| Rear (Back) track: | 1606 mm | 1479 mm |
| Front overhang: | 888 mm | |
| Rear overhang: | 1173 mm | |
| Minimum volume of Luggage (trunk): | 560 l | 390 l |
| Maximum amount of Luggage (trunk): | 1250 l | |
| Front suspension: | Wishbone | |
| Rear suspension: | Suspension with traction connecting levers | |
| Max weight: | 2640 kg | 1915 kg |
| Front brakes: | Disc | Ventilated discs |
| Rear brakes: | Disc | Disc |
| Kerb Weight: | 1955 kg | 1365 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | |
| Minimum turning circle (turning diameter): | 11.8 m | 11.1 m |
| Tire size: | 255/45 R18 | 195/65 R15 |
| Wheel rims size: | R18 | R15 |