I have used swift for almost good 3 years. Now i sold mine. It was new in 2015.
Now im thinking to buy another car, believe me my mind didnt accept any other option other then swift again.
In my view, swift is the best product suzuki ever produced. (Have khyber and mehran also)
Other then mileage, its one power pack.
Suggestions : please try to maintain it from suzuki dealership, if not all the parts, just use suzuki original oil (persnal experiemce)