I sold mine after 70k kms, last Nov. It was a 2015 model. I know people with upto 175k kms driven with proper compression and working well. So I guess you are not going to have an issue with the engine at least for the next 5-6 years.
As for fuel economy, I used to get 12-13 with AC in city, 15-17 on highway, depending on speed, load and other things. The lowest I ever got was 10.75 with AC in Lahore, the highest I got was from Mianwali to Lahore. Normal within Lahore city was somewhere in the middle. The highest I got in Lahore city was 15.22.
I have written a detailed review of the car here.