A friend of mine has a 2004 Vios, standard, no modifications at all. She has been complaining lately she feels that she is re-fuelling more frequently. Basically she would pump RM60 per week on RON95 and that would only last somewhere between 330km to 375km. Am I right that the FC is about 10-11kmpl? Isnt that really low for a 1.5 car? If so, whats the likely culprit thats using the fuel?