3 or 4 things to do, change to 9.5mm plug cable, Bosch Super 4, bypass the catalytic converter on exhause, change the extractor from 4-2-1 to 4-1(I not yet change) With the speed always maintained at >110km/h, FC is 13km/l and if maintain speed at <70km/h, FC is 16km/l. By changing air filter it will be a good way to get the throttle body blocked.

Typical problem for Wira injection : TB blocked very easy, this can be cleaned using a clean cloth.

To prevent problems on engine : put injection cleaner every 3000km or whenever you like, best time to pour is when fuel tank 5-10% and drive until car fuel tank red light on, as don't know what type of ingredients they used, maybe acid. So after this can fill up the tank till full to dilute the cleaner.