salamat boss s10pao for the suggestion, road conditions is also a factor, i remember nung na achieve ko yung 19km/L, distance travelled was around 200km in a well paved asphalt road no uphill or downhill with only 3 of us in the car, sa negros occidental yun(from Bacolod City to Cadiz City). i remember that day kasi konti lang yung kasama mong sasakyan along the way, no traffic, smooth travel talaga and one of the most enjoyable drive =). next na paguwi namin ng bacolod balak ko naman is to check the wheel alignment just to be sure. btw cannot remember the model number of my denso iridium sparkplug (either ixu22 or vxu22) but i made sure na yun ang compatible sa oem denso sparkplug na for avanza.