VW POLO fuel consumption 2003

Friends a pleasure to greet them ..... I tell you that I have a VW Polo Sedan 2003, engine 1.6 The car currently makes me 35 km by galon, in the agency they tell me that I would Economy older I am doing 35 km per gallon, the question is:
What should this be due? ... What should I do? What is the real consumption per km? It is possible to put that the car works well, nothing is off the normal, I have measured the consumption without using the air conditioning ...

His help please

greetings

Mante