Comparison Audi A8 Long (D3, 4E, facelift 2005) 6.0 W12 (450 Hp) quattro Tiptronic & Vauxhall Signum 2.2i 16V Direct ECOTEC (155 Hp) Automatic & Audi Q2 (facelift 2020) 35 TFSI (150 Hp) S tronic & Audi A6 Limousine (4G, C7 facelift 2014) 3.0 TDI V6 clean diesel (218 Hp) quattro S tronic & Audi A6 Limousine (4G, C7) 3.0 TDI V6 (204 Hp) Multitronic
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| Brand: | Audi | Vauxhall | Audi | Audi | Audi |
| Model: | A8 | Signum | Q2 | A6 | A6 |
| Generation: | A8 Long (D3, 4E, facelift 2005) | Signum | Q2 (facelift 2020) | A6 Limousine (4G, C7 facelift 2014) | A6 Limousine (4G, C7) |
| Engine / modification: | 6.0 W12 (450 Hp) quattro Tiptronic | 2.2i 16V Direct ECOTEC (155 Hp) Automatic | 35 TFSI (150 Hp) S tronic | 3.0 TDI V6 clean diesel (218 Hp) quattro S tronic | 3.0 TDI V6 (204 Hp) Multitronic |
| Production start: | 2005 year | 2003 year | 2020 year | 2014 year | 2011 year |
| Production end: | 2007 year | 2008 year | 2018 year | 2014 year | |
| Coupe type: | Sedan | Hatchback | SUV | Sedan | Sedan |
| Num. of Doors: | 4 | 5 | 5 | 4 | 4 |
| Num. of seats: | 5 | 5 | 5 | 5 | 5 |
| Fuel consumption / economy - urban: | 20.1 l/100 km | 11.6 l/100 km | 5.9 l/100 km | 5.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.8 l/100 km | 6.4 l/100 km | 4.6 l/100 km | 4.6 l/100 km | |
| Fuel consumption / economy - combined: | 13.6 l/100 km | 8.3 l/100 km | 5.1 l/100 km | 5.1 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) | Petrol (Gasoline) | Diesel | Diesel |
| Drag coefficient: | 0.28 | 0.28 | 0.27 | 0.28 | |
| Fuel tank volume: | 90 l | 50 l | 73 l | 65 l | |
| Combined fuel consumption (WLTP): | 6.0-6.5 l/100 km | ||||
| Emission standard: | Euro 4 | Euro 4 | Euro 6d-ISC-FCM | Euro 6 | Euro 5 |
| CO2 emissions: | 199 g/km | 133 g/km | 133 g/km | ||
| Power: | 450 hp | 155 hp | 150 hp | 218 hp | 204 hp |
| Max power in: | 6200 rpm. | 5600 rpm. | 5000-6000 rpm. | 3250-4500 rpm. | 3250-4500 rpm. |
| Maximum speed: | 250 km/h | 206 km/h | 218 km/h | 244 km/h | 240 km/h |
| Acceleration from 0 to 100 km/h: | 5.2 sec | 8.6 sec | 6.6 sec | 7.2 sec | |
| CO2 emissions (WLTP): | 136-148 g/km | ||||
| Torque: | 580 Nm @ 4000-4700 rpm. | 220 Nm @ 3800 rpm. | 250 Nm @ 1500-3500 rpm. | 500 Nm @ 1250-3000 rpm. | 450 Nm @ 1250-3500 rpm. |
| Model Engine: | BHT, BSB, BTE | DADA, DPCA | CRTE, CTCC | CLAA, CLAB | |
| Engine position: | Front, longitudinal | Front, transverse | Front, longitudinal | Front, longitudinal | |
| Engine displacement: | 5998 cm3 | 2198 cm3 | 1498 cm3 | 2967 cm3 | 2967 cm3 |
| Engine oil capacity: | 12.5 l | 4.3 l | 6.1-6.4 l | 6.4 l | |
| Coolant: | 18.9 l | 11.5 l | 11.5 l | ||
| Fuel System: | Multi-point injection | Multi-point injection | Direct injection | Diesel Commonrail | Diesel Commonrail |
| Maximum engine speed: | 5000 rpm. | ||||
| Aspiration / Turbine: | Turbocharging | Turbocharger | Turbo / Intercooler (Turbocharging / Intercooler) | Turbo / Intercooler (Turbocharging / Intercooler) | |
| Position of cylinders: | W engine | Inline | Inline | V engine | V engine |
| Valvetrain: | DOHC | DOHC | DOHC | DOHC | |
| Number of cylinders: | 12 | 4 | 4 | 6 | 6 |
| Number of valves per cylinder: | 4 | 4 | 4 | 4 | 4 |
| Compression ratio: | 10.75 | 12 | 16 | 16.8 | |
| Piston Stroke: | 90.2 mm | 94.6 mm | 91.4 mm | 91.4 mm | |
| Cylinder Bore: | 84 mm | 86 mm | 83 mm | 83 mm | |
| Wheel Drive: | All wheel drive (4x4) | Front wheel drive | Front wheel drive | All wheel drive (4x4) | Front wheel drive |
| Number of Gears (automatic transmission): | 6 Tiptronic | 5 | 7 S tronic | 7 S tronic | Multitronic |
| Length: | 5192 mm | 4651 mm | 4208 mm | 4933 mm | 4915 mm |
| Width: | 1894 mm | 1798 mm | 1794 mm | 1874 mm | 1874 mm |
| Width including mirrors: | 2036 mm | 2009 mm | 2086 mm | 2086 mm | |
| Height: | 1455 mm | 1466 mm | 1508 mm | 1455-1468 mm | 1468 mm |
| Wheelbase: | 3074 mm | 2830 mm | 2601 mm | 2912 mm | 2912 mm |
| Front track: | 1619 mm | 1546 mm | 1627 mm | 1627 mm | |
| Rear (Back) track: | 1605 mm | 1542 mm | 1618 mm | 1618 mm | |
| Front overhang: | 830 mm | 930 mm | 912 mm | ||
| Rear overhang: | 777 mm | 1091 mm | 1091 mm | ||
| Minimum volume of Luggage (trunk): | 500 l | 365 l | 405 l | 530 l | 530 l |
| Maximum amount of Luggage (trunk): | 1410 l | 1050 l | 995 l | 995 l | |
| Front suspension: | Multi-link suspension | Independent, Spring McPherson, with stabilizer | Independent type McPherson | Multi-link suspension | Multi-link suspension |
| Rear suspension: | Independent on trapezoidal lever | Multi-link independent | Semi-independent, spring | Independent on trapezoidal lever | Independent on trapezoidal lever |
| Max weight: | 2545 kg | 1870 kg | 2375 kg | 2225 kg | |
| Front brakes: | Ventilated discs | Ventilated discs | Ventilated discs | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc | Disc | Ventilated discs | Disc |
| Kerb Weight: | 1995 kg | 1415 kg | 1305 kg | 1765 kg | 1645 kg |
| ABS: | yes | yes | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Electric Steering | Electric Steering | Electric Steering | |
| Max. roof load: | 60 kg | 100 kg | 100 kg | ||
| Permitted trailer load with brakes (8%): | 1700 kg | 2100 kg | 1900 kg | ||
| Minimum turning circle (turning diameter): | 12.5 m | 11.1 m | 11.9 m | 11.9 m | |
| Permitted trailer load with brakes (12%): | 1500 kg | 2000 kg | 1800 kg | ||
| Permitted trailer load without brakes: | 690 kg | 750 kg | 750 kg | ||
| Permitted towbar download: | 75 kg | 85 kg | 85 kg | ||
| Tire size: | 235/55 R17 | 225/55 R17 | 225/60 R16 | ||
| Wheel rims size: | 8J x 17 | 8.0J x 17 | 7.5J x 16 |