I also have Probox 1300 cc 2006 model. My consumption in the city (Lahore) is 12 Km/L while on long route, its minimum consumption is 15km/L and got consumption upto 18Km/L, 1. Please timely change engine oil and fuel and air filter. 2. Have its engine tuning timely, 3. Have speed limit below 100 Km/h, 4. Accelate politly,