Mileage of 4.5 km/liter on automatic

The W10 automatic gives me a mileage of 4.5 km/litre. The last 10 times I have filled the tank of 70 litres it shows "Low" fuel at 300 km. The mileage screen is faulty, I think the lowest number on it is 9.

I complained to Mahindra many times, they got 5.5 km/litre by their own technicians, then did another test where they manipulated the test - chose roads with no traffic and no signals, filled more than the full to give a slighly better number.

EIther my vehicle is defective or the design of automatic engine is flawed. My complaints are brushed off by Mahindra. I have made several complaints and they did nothing but tests according to their convenience on roads where where is no traffic and no signals. This car is supposedly an Urban SUV to be driven in the city. For a car of Rs. 20 lakhs, the returns are poor. A buyer should think more before investing. Am thoroughly disappointed with the car and see it as a huge loss for my money.