Comparison Audi R8 Coupe 4.2 FSI V8 (420 Hp) quattro R tronic & GMC Sierra 2500HD III (GMT900, facelift 2011) Extended Cab Long Box 6.6 Duramax TD V8 (397 Hp) 4WD Automatic
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| Brand: | Audi | GMC |
| Model: | R8 | Sierra 2500HD |
| Generation: | R8 Coupe | Sierra 2500HD III (GMT900, facelift 2011) Extended Cab Long Box |
| Engine / modification: | 4.2 FSI V8 (420 Hp) quattro R tronic | 6.6 Duramax TD V8 (397 Hp) 4WD Automatic |
| Production start: | 2006 year | 2011 year |
| Production end: | 2010 year | 2014 year |
| Coupe type: | Coupe | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 2 | 2 |
| Num. of seats: | 2 | 5 |
| Fuel consumption / economy - urban: | 20.4 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.6 l/100 km | |
| Fuel consumption / economy - combined: | 13.6 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.34 | |
| Fuel tank volume: | 75 l | 136 l |
| Emission standard: | Euro 4 | |
| Power: | 420 hp | 397 hp |
| Max power in: | 7800 rpm. | 3000 rpm. |
| Maximum speed: | 301 km/h | |
| Acceleration from 0 to 100 km/h: | 4.6 sec | |
| Torque: | 430 Nm @ 4500-5500 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | BYH | Duramax LML |
| Engine position: | Rear, longitudinal | |
| Engine displacement: | 4163 cm3 | 6599 cm3 |
| Engine oil capacity: | 9.5 l | |
| Coolant: | 24 l | |
| Fuel System: | Direct injection | |
| Maximum engine speed: | 8250 rpm. | 3000 rpm. |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | OHV |
| Number of cylinders: | 8 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 12.5 | 16 |
| Piston Stroke: | 92.8 mm | 99 mm |
| Cylinder Bore: | 84.5 mm | 103 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 6 R tronic | |
| Length: | 4431 mm | 6337 mm |
| Width: | 1904 mm | |
| Width including mirrors: | 2029 mm | 2032 mm |
| Height: | 1252 mm | 1971 mm |
| Wheelbase: | 2650 mm | 4018 mm |
| Front track: | 1638 mm | 1748 mm |
| Rear (Back) track: | 1595 mm | 1709 mm |
| Ride height(clearance): | 214 mm | |
| Front overhang: | 999 mm | |
| Rear overhang: | 782 mm | |
| Minimum volume of Luggage (trunk): | 100 l | |
| Maximum amount of Luggage (trunk): | 2138 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Independent torsion bar, double wishbone |
| Rear suspension: | Independent, spring multi-link with stabilizer | |
| Max weight: | 1865 kg | 4536 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1565 kg | 3300 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Minimum turning circle (turning diameter): | 11.8 m | 15.8 m |
| Permitted trailer load with brakes (12%): | 5897 kg | |
| Tire size: | 235/40 R18; 285/35 R18 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 8.5J x 18; 10.5J x 18 | 7.5J x 17; 8J x 18; 8.5J x 20 |