Maruti Suzuki — mileage

Address:

Ghaziabad, Uttar Pradesh

I am fed up with the after sales service of REGENT MARUTI SUZUKI DEALER which is in ghaziabad.
every time i go for service i put a complaint regarding the average of my car but they never do anything
n after checking my average again when i go their again nobody even bothers about listening to me..
I own a SWIFT Vxi which is supposed to give atleast an aversge of 13 but it only gives around 9-9.5..