Comparison GMC Sierra 2500HD III (GMT900) Regular Cab Long Box 6.6 Duramax TD V8 (365 Hp) 4WD Automatic & Rolls-Royce Phantom Extended Wheelbase (facelift 2012) 6.7 V12 (460 Hp) Automatic
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| Brand: | GMC | Rolls-Royce |
| Model: | Sierra 2500HD | Phantom |
| Generation: | Sierra 2500HD III (GMT900) Regular Cab Long Box | Phantom Extended Wheelbase (facelift 2012) |
| Engine / modification: | 6.6 Duramax TD V8 (365 Hp) 4WD Automatic | 6.7 V12 (460 Hp) Automatic |
| Production start: | 2007 year | 2012 year |
| Production end: | 2010 year | 2016 year |
| Coupe type: | Pick-up | Sedan |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 2 | 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 | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 129 l | 100 l |
| CO2 emissions: | 349 g/km | |
| Power: | 365 hp | 460 hp |
| Max power in: | 3200 rpm. | 5350 rpm. |
| Maximum speed: | 240 km/h | |
| Acceleration from 0 to 100 km/h: | 6.1 sec | |
| Torque: | 895 Nm @ 1600 rpm. | 720 Nm/3500 rpm. |
| Model Engine: | Duramax LMM | |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 6599 cm3 | 6749 cm3 |
| Engine oil capacity: | 9.5 l | 8.5 l |
| Coolant: | 24 l | 14 l |
| Fuel System: | Direct injection | |
| Maximum engine speed: | 3450 rpm. | |
| Position of cylinders: | V engine | |
| Valvetrain: | OHV | |
| Number of cylinders: | 8 | 12 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16.8 | |
| Piston Stroke: | 99 mm | 84.6 mm |
| Cylinder Bore: | 103 mm | 92 mm |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 8 | |
| Length: | 5708 mm | 6092 mm |
| Width: | 1990 mm | |
| Width including mirrors: | 2032 mm | |
| Height: | 1939 mm | 1640 mm |
| Wheelbase: | 3378 mm | 3820 mm |
| Front track: | 1744 mm | 1686 mm |
| Rear (Back) track: | 1676 mm | 1676 mm |
| Ride height(clearance): | 243 mm | |
| Minimum volume of Luggage (trunk): | 460 l | |
| Maximum amount of Luggage (trunk): | 2138 l | |
| Front suspension: | Independent torsion bar, double wishbone | |
| Max weight: | 4173 kg | 3170 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 2853 kg | 2670 kg |
| ABS: | yes | |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 13.8 m | 13.8 m |
| Permitted trailer load with brakes (12%): | 5897 kg | |
| Tire size: | 245/75 R16; 265/75 R17 | 255/50 R21; 285/45 R21 |
| Wheel rims size: | 6.5J x 16; 7.5J x 17 | 8J x 21; 9.5J x 21 |