PETROL AT CITY DRIVE FUEL AVERAGE 6.8 KMPL

I bought ford Ecosport automatic transmission in August from Harpreet ford Moti nagar Delhi, I liked the looks and comfort of this car and was among the first few customers to book this car in december 2012 with a priority no 19. i was really very excited all these days .

Now I am feeling being cheated by Ford because at the time of selling and in the brouchre they claim fuel average of this car to be around around 15 kmpl with a total new engine technology etc. i assumed that i will get atleast 11-12 kmpl and bought this car on down payment now even after first service still its giving average of only 6.8 Kmpl in city drive . Till date in 2200 kms drive i have spent 25000 rs on petrol . The dealer and service station people are not having any solution for this problem and just giving unprofessional reply and excuses .

Please advise what to do ?will consumer court or any other forum will listen to my problem ?