Comparison Buick Regal IV Sedan 3.8 V6 (243 Hp) Automatic & Rolls-Royce Ghost Extended Wheelbase (facelift 2015) 6.6 V12 (570 Hp) Automatic
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| Brand: | Buick | Rolls-Royce |
| Model: | Regal | Ghost |
| Generation: | Regal IV Sedan | Ghost Extended Wheelbase (facelift 2015) |
| Engine / modification: | 3.8 V6 (243 Hp) Automatic | 6.6 V12 (570 Hp) Automatic |
| Production start: | 1997 year | 2015 year |
| Production end: | 2004 year | |
| Coupe type: | Sedan | Sedan |
| Num. of Doors: | 4 | 4 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - urban: | 13.1 l/100 km | 22.0 l/100 km |
| Fuel consumption / economy - extra urban: | 8.7 l/100 km | 10.0 l/100 km |
| Fuel consumption / economy - combined: | 10.2 l/100 km | 14.4 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.32 | 0.33 |
| Fuel tank volume: | 64 l | 82.5 l |
| Emission standard: | EURO VI | |
| CO2 emissions: | 329 g/km | |
| Power: | 243 hp | 570 hp |
| Max power in: | 5200 rpm. | 5250 rpm. |
| Maximum speed: | 220 km/h | 250 km/h |
| Acceleration from 0 to 100 km/h: | 6.8 sec | 5.0 sec |
| Torque: | 380 Nm @ 3600 rpm. | 820 Nm/1500 rpm. |
| Model Engine: | L67 | |
| Engine position: | Front, transverse | Front, longitudinal |
| Engine displacement: | 3791 cm3 | 6592 cm3 |
| Engine oil capacity: | 4.3 l | |
| Coolant: | 11.5 l | |
| Fuel System: | Multi-point injection | Direct injection |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | |
| Position of cylinders: | V engine | V engine |
| Valvetrain: | - | |
| Number of cylinders: | 6 | 12 |
| Number of valves per cylinder: | 2 | 4 |
| Compression ratio: | 8.5 | 10 |
| Piston Stroke: | 86.36 mm | 88.3 mm |
| Cylinder Bore: | 96.52 mm | 89 mm |
| Wheel Drive: | Front wheel drive | Rear wheel drive |
| Number of Gears (automatic transmission): | 4 Hydramatic | 8 |
| Length: | 4983 mm | 5569 mm |
| Width: | 1847 mm | 1948 mm |
| Height: | 1438 mm | 1550 mm |
| Wheelbase: | 2769 mm | 3465 mm |
| Front track: | 1575 mm | 1622 mm |
| Rear (Back) track: | 1557 mm | 1660 mm |
| Minimum volume of Luggage (trunk): | 473 l | 490 l |
| Front suspension: | Independent type McPherson | |
| Rear suspension: | Independent, spring | |
| Max weight: | 2085 kg | 2970 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Disc | Ventilated discs |
| Kerb Weight: | 1645 kg | 2420 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Hydraulic Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 14.0 m | |
| Tire size: | 225/60 R16 | 255/50 R19 |
| Wheel rims size: | 6.5J x 16 | 8.5J x 19 |