Dear experts!

i recently own a new wagon r vxl from samanabad motors in silver color. many times i have measured the fuel consumption of my car in long rout and inter city as well. but it always disappoint me . it gives only 12 to 13km with a/c and 16 km without a/c. can any one have the solution of this problem as i know it is very bad efficiency by my car. my car has been 7000 km driven. please give your expert opinion.

Thanks......