Comparison Audi A6 Allroad quattro (4F,C6 facelift 2008) 3.0 TFSI V6 (290 Hp) quattro Tiptronic & GMC Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box 6.6 Duramax TD V8 (397 Hp) 4WD Automatic
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| Brand: | Audi | GMC |
| Model: | A6 | Sierra 2500HD |
| Generation: | A6 Allroad quattro (4F,C6 facelift 2008) | Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box |
| Engine / modification: | 3.0 TFSI V6 (290 Hp) quattro Tiptronic | 6.6 Duramax TD V8 (397 Hp) 4WD Automatic |
| Production start: | 2008 year | 2015 year |
| Production end: | 2011 year | 2017 year |
| Coupe type: | Combi | Pick-up |
| Powertrain Architecture: | Internal Combustion engine | |
| Num. of Doors: | 5 | 2 |
| Num. of seats: | 5 | 2 |
| Fuel consumption / economy - urban: | 13.3 l/100 km | |
| Fuel consumption / economy - extra urban: | 7.6 l/100 km | |
| Fuel consumption / economy - combined: | 9.7 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.33 | |
| Fuel tank volume: | 80 l | 136 l |
| Emission standard: | Euro 5 | |
| CO2 emissions: | 225 g/km | |
| Power: | 290 hp | 397 hp |
| Max power in: | 4850-6800 rpm. | 3000 rpm. |
| Maximum speed: | 250 km/h | |
| Acceleration from 0 to 100 km/h: | 6.3 sec | |
| Torque: | 420 Nm @ 2500-4850 rpm. | 1037 Nm @ 1600 rpm. |
| Model Engine: | CAJA | Duramax LML |
| Engine position: | Front, longitudinal | |
| Engine displacement: | 2995 cm3 | 6599 cm3 |
| Engine oil capacity: | 6.5 l | 9.5 l |
| Coolant: | 9.6 l | 22.4 l |
| Fuel System: | Direct injection | |
| Aspiration / Turbine: | Mechanical supercharging (Compressor) | |
| Position of cylinders: | V engine | |
| Valvetrain: | DOHC | OHV |
| Number of cylinders: | 6 | 8 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10.3 | 16 |
| Piston Stroke: | 89 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 Tiptronic | |
| Length: | 4934 mm | 5699 mm |
| Width: | 1862 mm | |
| Width including mirrors: | 2035 mm | |
| Height: | 1521 mm | 1975 mm |
| Wheelbase: | 2833 mm | 3393 mm |
| Front track: | 1596 mm | 1748 mm |
| Rear (Back) track: | 1587 mm | 1709 mm |
| Ride height(clearance): | 231 mm | |
| Minimum volume of Luggage (trunk): | 565 l | |
| Maximum amount of Luggage (trunk): | 1660 l | 2162 l |
| Front suspension: | Multi-link suspension | |
| Rear suspension: | Independent on trapezoidal lever | |
| Max weight: | 2470 kg | 4491 kg |
| Front brakes: | Ventilated discs | |
| Rear brakes: | Ventilated discs | |
| Kerb Weight: | 1840 kg | 2993 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls |
| Max. roof load: | 100 kg | |
| Permitted trailer load with brakes (8%): | 2100 kg | |
| Minimum turning circle (turning diameter): | 11.9 m | 14 m |
| Permitted trailer load with brakes (12%): | 1900 kg | 6577 kg |
| Permitted trailer load without brakes: | 750 kg | |
| Permitted towbar download: | 85 kg | |
| Tire size: | 225/55 R17 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size: | 7.5J x 17 | 7.5J x 17; 8J x 18; 8.5J x 20 |