Comparison Rolls-Royce Ghost Extended Wheelbase (facelift 2015) 6.6 V12 (570 Hp) Automatic & Buick Regal IV Sedan 3.8 V6 (197 Hp) Automatic
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| Brand: | Rolls-Royce | Buick |
| Model: | Ghost | Regal |
| Generation: | Ghost Extended Wheelbase (facelift 2015) | Regal IV Sedan |
| Engine / modification: | 6.6 V12 (570 Hp) Automatic | 3.8 V6 (197 Hp) Automatic |
| Production start: | 2015 year | 1997 year |
| Production end: | 2004 year | |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 22.0 l/100 km | 12.4 l/100 km |
| Fuel consumption / economy - extra urban: | 10.0 l/100 km | 7.8 l/100 km |
| Fuel consumption / economy - combined: | 14.4 l/100 km | 10.2 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.33 | 0.32 |
| Fuel tank volume: | 82.5 l | 64 l |
| Emission standard: | EURO VI | |
| CO2 emissions: | 329 g/km | |
| Power: | 570 hp | 197 hp |
| Max power in: | 5250 rpm. | 5200 rpm. |
| Maximum speed: | 250 km/h | |
| Acceleration from 0 to 100 km/h: | 5.0 sec | |
| Torque: | 820 Nm/1500 rpm. | 298 Nm @ 4000 rpm. |
| Model Engine: | L36 | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 6592 cm3 | 3791 cm3 |
| Engine oil capacity: | 4.3 l | |
| Coolant: | 11.5 l | |
| Fuel System: | Direct injection | Multi-point injection |
| Position of cylinders: | V engine | V engine |
| Number of cylinders: | 12 | 6 |
| Number of valves per cylinder: | 4 | 2 |
| Compression ratio: | 10 | 9.4 |
| Piston Stroke: | 88.3 mm | 86.36 mm |
| Cylinder Bore: | 89 mm | 96.52 mm |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 8 | 4 Hydramatic |
| Length: | 5569 mm | 4983 mm |
| Width: | 1948 mm | 1847 mm |
| Height: | 1550 mm | 1438 mm |
| Wheelbase: | 3465 mm | 2769 mm |
| Front track: | 1622 mm | 1575 mm |
| Rear (Back) track: | 1660 mm | 1557 mm |
| Minimum volume of Luggage (trunk): | 490 l | 473 l |
| Front suspension: | Independent type McPherson | |
| Rear suspension: | Independent, spring | |
| Max weight: | 2970 kg | 2005 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 2420 kg | 1564 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Hydraulic Steering |
| Minimum turning circle (turning diameter): | 14.0 m | |
| Tire size: | 255/50 R19 | 225/60 R16 |
| Wheel rims size: | 8.5J x 19 | R16 |