Hi Dharmen,
I have been driving my Tiago-XZ petrol variant since 5 month over 4300 happy kms. I am pretty impressed with the fuel economy.
Most of the distance are covered in Busy Bangalore traffic(many time I got bumper-to-bumper traffic) @ 15 -16 kmpl (AC on) and I had been to outstation and covered almost 900 km @ 23 kmpl (AC and ECO mode on).
However, on urgent move driving at high speed (avg @ 120 - 140 kmph), I got 18.5-19 kmpl on highway. (of course I had to turn off ECO mode)
In lower gears and uphill situations I do get vibration and noise from the dashboard and gear box. Even after 1st servicing the noise do exist.
My car had a bad fitting in the driver-front side panel(where you can find a parking ticket holder). I got the clip replaced and the noise is much reduced.
Moreover, 4 people on board, in lower gears (say 2nd gear at speed breakers) lack of power will tend you to shift to first gear. Ideally other 1.2ltr engines will drive you through quite smoothly. Initially that was quite annoying for me, but owing a 3 cylinder engine, I got used to it.
Considering the price offered with loads of features compared to the competitors, it definitely a Fantastico car...!!!