False promise

Regarding grievance- This is the extract of my letter sent to  GM Motors

Make/Model:Chevrolet Sail LS ABS Petrol
Sir, I had taken delivery of the above mentioned vehicle from Deedi Motors, Trivandrum during the launch of this new vehicle at Trivandrum. Now I am writing this letter regarding to low mileage of this vehicle. Myself and my brother together had booked for Swift D'zire VXi form Indus Motors,Tvm. At that time there was a delay of 3 months in receiving the vehicle. In the meantime I came across your beautiful advertisement of Chevrolet Sail Sedan, launching promising 18 km and many other features . My brother decided to take Swift D'zire while I subsequently cancelled the order and I booked for your product on the very first day of launching in  Trivandrum.

My brother is now satisfied with the performance and  mileage received , 15 km per litre from Swift d'zire, whereas I am getting only 9 km/per litre from your product. I am very sad for the false promise you had made in this launching. I really feel that I had been blind folded in this regard.

I would also take this opportunity to inform you that the pick up received by this vehicle is very poor when compared to Santro and Maruti , which I had previously used for 16 years.
It is high time  that some measure should be taken in this regard. I would thereby request you to conduct an official mileage test by the respective authority in this aspect.  
Thanking you, Yours faithfully, CC to Manager, Deedi Motos.