I have Passo XL Package S - 2WD,
mine gives average of 20. As per Japan standard it should give upto 28 but our petrol lags in quality.
Oil used 5w-20 but next service i will change it to 0w-20.
my model does not have RPM gauge so i try my best to drive non-aggressive. & use eco-idle where the system works easily not like engine cutting off every single minute.
What is the mileage of your car? Do check my above post for documentation.
Currently I am translating its manual from Japanese to English. I will share it too.
This engine is less maintenance if you follow the OEM instructions. NOT the local market which is hit & trial basis.
if you need any more help I will be glad to help you.
My location is Islamabad.