Comparison GMC Sierra 2500HD III (GMT900, facelift 2011) Extended Cab Standard Box 6.6 Duramax TD V8 (397 Hp) Automatic & Alfa Romeo Giulia (952) GTA 2.9 V6 (540 Hp) Automatic
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| Brand: | GMC | Alfa Romeo |
| Model: | Sierra 2500HD | Giulia |
| Generation: | Sierra 2500HD III (GMT900, facelift 2011) Extended Cab Standard Box | Giulia (952) |
| Engine / modification: | 6.6 Duramax TD V8 (397 Hp) Automatic | GTA 2.9 V6 (540 Hp) Automatic |
| Production start: | 2011 year | 2020 year |
| Production end: | 2014 year | 2021 year |
| Coupe type: | Pick-up | Sedan |
| Powertrain Architecture: | Internal Combustion engine | Internal Combustion engine |
| Num. of Doors: | 2 | 4 |
| Num. of seats: | 5 | 4 |
| Fuel consumption / economy - combined: | 11.7 l/100 km | |
| Fuel Type: | Diesel | Petrol (Gasoline) |
| Fuel tank volume: | 136 l | 58 l |
| Emission standard: | Euro 6d | |
| CO2 emissions: | 271 g/km | |
| Power: | 397 hp | 540 hp |
| Max power in: | 3000 rpm. | 6500 rpm. |
| Maximum speed: | 300 km/h | |
| Acceleration from 0 to 100 km/h: | 3.6 sec | |
| Torque: | 1037 Nm @ 1600 rpm. | 600 Nm @ 2500 rpm. |
| Model Engine: | Duramax LML | 670053796 |
| Engine displacement: | 6599 cm3 | 2891 cm3 |
| Engine oil capacity: | 9.5 l | 6.5 l |
| Coolant: | 24 l | 11.2 l |
| Maximum engine speed: | 3000 rpm. | |
| Valvetrain: | OHV | DOHC |
| Number of cylinders: | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 16 | 9.3 |
| Piston Stroke: | 99 mm | 82 mm |
| Cylinder Bore: | 103 mm | 86.5 mm |
| Wheel Drive: | Rear wheel drive | Rear wheel drive |
| Length: | 5857 mm | 4654 mm |
| Width: | 1923 mm | |
| Width including mirrors: | 2032 mm | 2024 mm |
| Height: | 1979 mm | 1445 mm |
| Wheelbase: | 3663 mm | 2820 mm |
| Front track: | 1748 mm | 1580 mm |
| Rear (Back) track: | 1709 mm | 1654 mm |
| Ride height(clearance): | 218 mm | |
| Front overhang: | 810 mm | |
| Rear overhang: | 1024 mm | |
| Minimum volume of Luggage (trunk): | 480 l | |
| Maximum amount of Luggage (trunk): | 1718 l | |
| Front suspension: | Independent torsion bar, double wishbone | Double wishbone |
| Max weight: | 4536 kg | 2150 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 3105 kg | 1605 kg |
| Steering type: | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Electric Steering | |
| Minimum turning circle (turning diameter): | 14.6 m | 11.3 m |
| Permitted trailer load with brakes (12%): | 5897 kg | |
| Tire size: | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | Front wheel tires: 265/30 R20 |
| Wheel rims size: | 7.5J x 17; 8J x 18; 8.5J x 20 | Front wheel rims: 9.5J x 20 |