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 & Mercedes-Benz R-class (W251) Long R 300 V6 (231 Hp) G-TRONIC
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| Brand: | Audi | GMC | Mercedes-Benz |
| Model: | R8 | Sierra 2500HD | R-class |
| Generation: | R8 Coupe | Sierra 2500HD III (GMT900, facelift 2011) Extended Cab Long Box | R-class (W251) Long |
| Engine / modification: | 4.2 FSI V8 (420 Hp) quattro R tronic | 6.6 Duramax TD V8 (397 Hp) 4WD Automatic | R 300 V6 (231 Hp) G-TRONIC |
| Production start: | 2006 year | 2011 year | 2009 year |
| Production end: | 2010 year | 2014 year | 2010 year |
| Coupe type: | Coupe | Pick-up | Combi |
| Powertrain Architecture: | Internal Combustion engine | ||
| Num. of Doors: | 2 | 2 | 5 |
| Num. of seats: | 2 | 5 | 5 |
| Fuel consumption / economy - urban: | 20.4 l/100 km | 15.2-15.4 l/100 km | |
| Fuel consumption / economy - extra urban: | 9.6 l/100 km | 8.8-9.0 l/100 km | |
| Fuel consumption / economy - combined: | 13.6 l/100 km | 11.1-11.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.34 | ||
| Fuel tank volume: | 75 l | 136 l | 80 l |
| Emission standard: | Euro 4 | EURO V | |
| CO2 emissions: | 260 g/km | ||
| Power: | 420 hp | 397 hp | 231 hp |
| Max power in: | 7800 rpm. | 3000 rpm. | 6000 rpm. |
| Maximum speed: | 301 km/h | 222 km/h | |
| Acceleration from 0 to 100 km/h: | 4.6 sec | 9.7 sec | |
| Torque: | 430 Nm @ 4500-5500 rpm. | 1037 Nm @ 1600 rpm. | 300 Nm @ 2500-5000 rpm. |
| Model Engine: | BYH | Duramax LML | |
| Engine position: | Rear, longitudinal | Front, longitudinal | |
| Engine displacement: | 4163 cm3 | 6599 cm3 | 2996 cm3 |
| Engine oil capacity: | 9.5 l | ||
| Coolant: | 24 l | ||
| Fuel System: | Direct injection | Multi-point injection | |
| Maximum engine speed: | 8250 rpm. | 3000 rpm. | |
| Position of cylinders: | V engine | V engine | |
| Valvetrain: | DOHC | OHV | |
| Number of cylinders: | 8 | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 | |
| Compression ratio: | 12.5 | 16 | 11.3 |
| Piston Stroke: | 92.8 mm | 99 mm | |
| Cylinder Bore: | 84.5 mm | 103 mm | |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) | Rear wheel drive |
| Number of Gears (automatic transmission): | 6 R tronic | 7G-TRONIC | |
| Length: | 4431 mm | 6337 mm | 5157 mm |
| Width: | 1904 mm | 1922 mm | |
| Width including mirrors: | 2029 mm | 2032 mm | |
| Height: | 1252 mm | 1971 mm | 1674 mm |
| Wheelbase: | 2650 mm | 4018 mm | 3215 mm |
| Front track: | 1638 mm | 1748 mm | 1661 mm |
| Rear (Back) track: | 1595 mm | 1709 mm | 1651 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 | 2385 l | |
| Front suspension: | Independent, Spring McPherson, with stabilizer | Independent torsion bar, double wishbone | Double wishbone |
| Rear suspension: | Independent, spring multi-link with stabilizer | Independent, spring multi-link with stabilizer | |
| Max weight: | 1865 kg | 4536 kg | 2840 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Ventilated discs | Disc | |
| Kerb Weight: | 1565 kg | 3300 kg | 2175 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Cone worm with recirculation balls | Steering rack and pinion |
| Power steering: | Hydraulic Steering | ||
| Minimum turning circle (turning diameter): | 11.8 m | 15.8 m | 12.4 m |
| Permitted trailer load with brakes (12%): | 5897 kg | 2100 kg | |
| Permitted trailer load without brakes: | 750 kg | ||
| Tire size: | 235/40 R18; 285/35 R18 | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 | 255/55 R18 |
| Wheel rims size: | 8.5J x 18; 10.5J x 18 | 7.5J x 17; 8J x 18; 8.5J x 20 | R18 |