Mira 13-14 automatic, car had multiple issues, when I took over the maintenance of the car it had ECO Idle flashing which I got checked and found battery replacement solved the issue, before that mileage was stuck at 15km/L. After replacing the battery it went down to 13, my civic turbo was doing 12 in city, I put in fuel system and fuel injector clean by STP which helped improved mileage to 13-14 km/L, changed oil and filter and air cleaner it further improved to 15-15.5, then last Friday got the throttle body and plugs cleaned and was amazed to see the mileage jumped to 16+ km/L, filled her up took it to Nathyagali via Murree and came back via Abbotabad motorway, and to my surprise mileage jumped to 18.2 km/L.
Mechanic suggested to get the Catalytic converter cleaned as he noticed brown plugs, but I kept a light hand and wanted to do things step by step.
My next target is getting the Catalytic converter cleaned and will report back if thing improve on my end.