Comparison Mercedes-Benz GLS (x166) GLS 400 (333 Hp) 4MATIC G-TRONIC & GMC Sierra 2500HD V (GMTT1XX) Regular Cab Long Bed 6.6 Duramax TD V8 (445 Hp) Automatic & Audi A6 Avant (4G, C7) 3.0 TFSI V6 (300 Hp) quattro S tronic
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| Brand: | Mercedes-Benz | GMC | Audi |
| Model: | GLS | Sierra 2500HD | A6 |
| Generation: | GLS (x166) | Sierra 2500HD V (GMTT1XX) Regular Cab Long Bed | A6 Avant (4G, C7) |
| Engine / modification: | GLS 400 (333 Hp) 4MATIC G-TRONIC | 6.6 Duramax TD V8 (445 Hp) Automatic | 3.0 TFSI V6 (300 Hp) quattro S tronic |
| Production start: | 2015 year | 2020 year | 2011 year |
| Production end: | 2023 year | 2014 year | |
| Coupe type: | SUV | Pick-up | Combi |
| Powertrain Architecture: | Internal Combustion engine | ||
| Num. of Doors: | 5 | 2 | 5 |
| Num. of seats: | 5 | 2 | 5 |
| Fuel consumption / economy - urban: | 11.7-11.1 l/100 km | 10.8 l/100 km | |
| Fuel consumption / economy - extra urban: | 8.0-7.5 l/100 km | 6.6 l/100 km | |
| Fuel consumption / economy - combined: | 9.4-8.9 l/100 km | 8.2 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel | Petrol (Gasoline) |
| Drag coefficient: | 0.29 | ||
| Fuel tank volume: | 100 l | 106 l | 65 l |
| Emission standard: | EURO VI | Euro 5 | |
| CO2 emissions: | 218-206 g/km | 190 g/km | |
| Power: | 333 hp | 445 hp | 300 hp |
| Max power in: | 5250-6000 rpm. | 2800 rpm. | 5500-6500 rpm. |
| Maximum speed: | 240 km/h | 250 km/h | |
| Acceleration from 0 to 100 km/h: | 6.6 sec | 5.6 sec | |
| Torque: | 480 Nm/1600-4000 rpm. | 1234 Nm @ 1600 rpm. | 440 Nm @ 2900-4500 rpm. |
| Model Engine: | Duramax L5P | CGWB, CHMA | |
| Engine position: | Front, longitudinal | Front, longitudinal | |
| Engine displacement: | 2996 cm3 | 6604 cm3 | 2995 cm3 |
| Engine oil capacity: | 9.5 l | 6.8 l | |
| Coolant: | 29.1 l | 12.0 l | |
| Fuel System: | Direct injection | Direct injection | |
| Aspiration / Turbine: | BiTurbo | Turbo / Intercooler (Turbocharging / Intercooler) | |
| Position of cylinders: | V engine | V engine | |
| Valvetrain: | OHV | ||
| Number of cylinders: | 6 | 8 | 6 |
| Number of valves per cylinder: | 4 | 4 | |
| Compression ratio: | 10.5 | 16 | 10.3 |
| Piston Stroke: | 99 mm | 89 mm | |
| Cylinder Bore: | 103 mm | 84.5 mm | |
| Wheel Drive: | All wheel drive (4x4) | Rear wheel drive | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 9G-TRONIC | 7 S tronic | |
| Length: | 5130 mm | 5982 mm | 4926 mm |
| Width: | 1934 mm | 1874 mm | |
| Width including mirrors: | 2141 mm | 2076 mm | 2086 mm |
| Height: | 1850 mm | 2030 mm | 1468 mm |
| Wheelbase: | 3075 mm | 3595 mm | 2912 mm |
| Front track: | 1655 mm | 1731 mm | 1874 mm |
| Rear (Back) track: | 1675 mm | 1736 mm | 1618 mm |
| Ride height(clearance): | 259 mm | 117 mm | |
| Front overhang: | 912 mm | ||
| Rear overhang: | 1102 mm | ||
| Minimum volume of Luggage (trunk): | 680 l | 565 l | |
| Maximum amount of Luggage (trunk): | 2300 l | 1680 l | |
| Front suspension: | Double wishbone | Multi-link suspension | |
| Rear suspension: | Multi-link independent | Independent on trapezoidal lever | |
| Max weight: | 3250 kg | 4785 kg | 2350 kg |
| Front brakes: | Ventilated discs | Ventilated discs | |
| Rear brakes: | Ventilated discs | Disc | |
| Kerb Weight: | 2360 kg | 3161 kg | 1865 kg |
| ABS: | yes | yes | |
| Steering type: | Steering rack and pinion | Steering rack and pinion | Steering rack and pinion |
| Power steering: | Electric Steering | Electric Steering | |
| Max. roof load: | 100 kg | 100 kg | |
| Minimum turning circle (turning diameter): | 12.40 m | 11.9 m | |
| Permitted trailer load with brakes (12%): | 3500 kg | 6577 kg | |
| Permitted trailer load without brakes: | 750 kg | 750 kg | |
| Permitted towbar download: | 85 kg | ||
| Tire size: | 265/60 R18 | 235/80 R17; 265/70 R17; 245/75 R17; 265/70 R18; 265/60 R20 | 225/55 R17 |
| Wheel rims size: | R18 | 7.5J x 17; 8J x 18; 8.5J x 20 | 8J x 17 |