Suzuki Access 125 — Fuel efficiency Average 20 kmpl

Address:

360005

I have bought my new access 125 special edition from patel suzuki Rajkot, Gujarat on 14th dec 2015, so far i have fed in 7.5 liters of petrol so far 1+2+half +4 and it has only given me only 155km so far and the tank is almost empty, lets say in total it might give me 160/7.5 = 20.33 kmpl where as the company promises 55-60kmpl but as per users review you at least get 40-50kmpl depending on riding conditions. i bought access due to its good fuel mileage but i am disappointed, i would like to know the reason for this low mileage and also resolve the issue asap, please guide.