Thanks for your quick response.
This car is good, as I am driving the car first time so, I cannot make a good comparison of Euro II mehran with old one. However, the people in my circle commented that euro II is much more better in performance than old Mehran's.
I went to mechanic to fix the Horn because horn sound went down :S. Before the second tuning of my car I was well satisfied with performance but after second tuning which I got from Suzuki Authorized dealer my car milage went down like from 16 KM/Lt around 14 Km/L and car is started producing sounds :(.
P.S. I am resident of Lahore and do use Total's petrol.