After a lot of research, I went for 5w-30 Total Quartz 9000 Future GF-5 (Fully Synthetic) for my 2016 1.6.
The fuel economy has been great, well, at least better than before, I still haven't tested much as I have been driving in my locality, where speed breakers & potholes are present every few yards on the road & therefore, I have to keep breaking.
It's showing me a 7.2/L average and rising. Before it was showing me 5.7/L with Guard Oil, which almost killed my fuel economy.
I also changed Air Filter, Oil Filter to Toyota’s genuine. I believe Total engine oil is the way to go.
The irony is that I got it changed at the Guard outlet, just because their workshop is clean and it's located inside a shopping mart.