Thank you so much, I appreciate it. I see that you're doing a lot of effort to fix the fuel average, but understandably for a PKDM swift 11-12km/l is a really good average, trust me. The M13A engine that the PKDM swift is equipped is a world renowned gas guzzler, it's the same engine as in the PKDM Liana. So, to address the elephant in the room, I don't think you'll get much more out of it than 11-12km/l.
P.S. You should not mess with any sensors at all, until and unless the car gives a CEL and tells you to. Please, speaking from experience, sensors are very delicate , and only until and unless they are messing up, should you do anything about them. And you'll know if they're messing up if the car gives you the CEL, otherwise it means the sensors are working perfectly as they should and shouldn't be tampered with. Hope this helps.