What is the mileage of Mercedes GLS?

The Mercedes GLS is offered with a 3.0 L, V6 diesel engine in India. It produces 258 HP @ 3400 rpm and 620 Nm @ 1600-2400 rpm. It comes mated to a 9-speed automatic gearbox and returns a mileage of around 10 kmpl or 24 mpg. When driven constantly on highway at moderate speeds, the car can return 12 kmpl or 30 mpg but the chances are rare in countries like India. The car comes with a price tag of INR 80,40,000. It takes 7.8 seconds for the car to touch 100 kmph from standstill.