Hmm Hard to diagnose... Last i checked my car in 600 Rs did around 98 KM.
I also changed 3 of my fuel injectors as they were leaking. the New ones are green one and the previous one i had were yellow. Green ones are lower in CC than yellow by Denso.
I remember we had a corolla 84 my (my Master pass) mechanic suggested after reading manuals to change its carborator jets to factory specs and i agreed..
I remember car was doin fine but as soon as new jets installed on motorway going to sargodha that is not far from isb it consumed close to 1.5 tank and you can clearly see the needle going down...