alarmingly low mileage of a gorgeous car

I have purchased a Fiat garande Punto Active1.3 diesel in October, 2010.The car is excellent in look.The cars interior plastic quality is very bad.Plastic covers (inside)are coming out. Ground clearance is very low and cannot take care of city-bumps.Most alarming point is that for last 10 months I am getting a mileage of just 6.7 kmpl in city.