Need to buy a car with mileage as priority, next comes safety and other features. Car will be for my dad who will be driving mostly in the city itself. He would be driving it light foot and hence performance is not my top most priority. He is currently owing Maruti 800 CNG and wants an upgrade. There are 3 members in the family. Future requirement would be of CNG though I am not in favour of this decision. He needs a value for money car basically. Suggest some good options as per my requirement. Some shortlisted options: Tiago(3 cylinder hence have doubts), Wagonr,Tigor, Ignis , Santro, I10 NIOS.