Comparison Rolls-Royce Dawn 6.6 V12 (571 Hp) Automatic & Buick Regal V Sedan 2.4 (182 Hp) eAssist Start/Stop Automatic
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| Brand: | Rolls-Royce | Buick |
| Model: | Dawn | Regal |
| Generation: | Dawn | Regal V Sedan |
| Engine / modification: | 6.6 V12 (571 Hp) Automatic | 2.4 (182 Hp) eAssist Start/Stop Automatic |
| Production start: | 2016 year | 2011 year |
| Production end: | 2013 year | |
| Coupe type: | Cabriolet | Sedan |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 4 | 5 |
| Fuel consumption / economy - urban: | 22.1 l/100 km | 9.4 l/100 km |
| Fuel consumption / economy - extra urban: | 10.0 l/100 km | 6.5 l/100 km |
| Fuel consumption / economy - combined: | 14.4 l/100 km | 8.1 l/100 km |
| Fuel Type: | Petrol (Gasoline) | Petrol (Gasoline) |
| Drag coefficient: | 0.30 | |
| Fuel tank volume: | 70 l | |
| CO2 emissions: | 330 g/km | |
| Power: | 571 hp | 182 hp |
| Max power in: | 5250-6000 rpm. | 6700 rpm. |
| Maximum speed: | 250 km/h | 226 km/h |
| Acceleration from 0 to 100 km/h: | 5.0 sec | 8.3 sec |
| Torque: | 820 Nm/1500-5000 rpm. | 233 Nm @ 4900 rpm. |
| Model Engine: | LUK | |
| Engine position: | Front, longitudinal | Front, transverse |
| Engine displacement: | 6592 cm3 | 2384 cm3 |
| Engine oil capacity: | 4.7 l | |
| Coolant: | 7.1 l | |
| Fuel System: | Direct injection | Direct injection |
| Maximum engine speed: | 7000 rpm. | |
| Position of cylinders: | V engine | Inline |
| Valvetrain: | DOHC-CVVT | |
| Number of cylinders: | 12 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 11.2 | |
| Piston Stroke: | 98 mm | |
| Cylinder Bore: | 88 mm | |
| Electric motor power: | 15 | |
| Electric motor Torque: | 1000-2200 Nm | |
| Battery capacity: | 0.5 kWh | |
| ICE Torque: | 280 Nm/3500 rpm. | |
| ICE power: | 200 hp | |
| System power: | 200 hp @ 6 hp/ rpm. | |
| System torque: | 280 Nm @ 3 Nm/ rpm. | |
| Wheel Drive: | Rear wheel drive | Front wheel drive |
| Number of Gears (automatic transmission): | 8 | 6 |
| Length: | 5285 mm | 4831 mm |
| Width: | 1947 mm | 1857 mm |
| Height: | 1502 mm | 1483 mm |
| Wheelbase: | 3112 mm | 2738 mm |
| Front track: | 1585 mm | |
| Rear (Back) track: | 1587 mm | |
| Minimum volume of Luggage (trunk): | 314 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | |
| Rear suspension: | Multi-link independent | |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 2560 kg | 1641 kg |
| ABS: | yes | yes |
| Steering type: | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering |
| Minimum turning circle (turning diameter): | 11.4 m | |
| Tire size: | 235/50 R17 | |
| Wheel rims size: | 7J x 17 |