Comparison Rolls-Royce Phantom Extended Wheelbase (facelift 2012) 6.7 V12 (460 Hp) Automatic & Buick Roadmaster Wagon 5.7 i V8 (264 Hp)
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| Brand: | Rolls-Royce | Buick |
| Model: | Phantom | Roadmaster |
| Generation: | Phantom Extended Wheelbase (facelift 2012) | Roadmaster Wagon |
| Engine / modification: | 6.7 V12 (460 Hp) Automatic | 5.7 i V8 (264 Hp) |
| Production start: | 2012 year | 1993 year |
| Production end: | 2016 year | 1997 year |
| Coupe type: | Sedan | Combi |
| Num. of Doors: | 4 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 23.0 l/100 km | |
| Fuel consumption / economy - extra urban: | 10.2 l/100 km | |
| Fuel consumption / economy - combined: | 14.9 l/100 km | 11.8 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Fuel tank volume: | 100 l | 83 l |
| CO2 emissions: | 349 g/km | |
| Power: | 460 hp | 264 hp |
| Max power in: | 5350 rpm. | 5000 rpm. |
| Maximum speed: | 240 km/h | |
| Acceleration from 0 to 100 km/h: | 6.1 sec | |
| Torque: | 720 Nm/3500 rpm. | 454 Nm/3200 rpm. |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 6749 cm3 | 5733 cm3 |
| Engine oil capacity: | 8.5 l | |
| Coolant: | 14 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Position of cylinders: | V engine | V engine |
| Number of cylinders: | 12 | 8 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 10.5 | |
| Piston Stroke: | 84.6 mm | 88.4 mm |
| Cylinder Bore: | 92 mm | 101.6 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 | 4 |
| Length: | 6092 mm | 5526 mm |
| Width: | 1990 mm | 2028 mm |
| Height: | 1640 mm | 1531 mm |
| Wheelbase: | 3820 mm | 2945 mm |
| Front track: | 1686 mm | 1578 mm |
| Rear (Back) track: | 1676 mm | 1628 mm |
| Minimum volume of Luggage (trunk): | 460 l | |
| Maximum amount of Luggage (trunk): | 2616 l | |
| Front suspension: | Double wishbone | |
| Rear suspension: | Helical spring | |
| Max weight: | 3170 kg | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Drum |
| Kerb Weight: | 2670 kg | 2045 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | |
| Power steering: | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 13.8 m | |
| Tire size: | 255/50 R21; 285/45 R21 | 225/70 R15 S |
| Wheel rims size: | 8J x 21; 9.5J x 21 |