hi,

4g15 sohc carb user here. i am averaging 9 km/l with my car. my brother in laws car is the same model with the same engine. pareho kami stock, as in lahat pareho. ang konsumo ng kanya e 12 km/l. same route, same traffic, same driver (which is me).

i have already tuned up, changed oil, changed spark plugs, even cleaned the carb with carb cleaner.

what else could be the problem?