What is the problem with the recent sudden increase in fuel consumption of polo 1.4 Power Fashion Edition bought in June 2008?

Carbon deposit, throttle and nozzle, comprehensive cleaning! If cleaned well, the car will obviously save fuel and be full of energy. If the cleaning is not thorough, the idle speed will be unstable and the fuel consumption will increase. You must go to the 4S shop for maintenance. Check the air flowmeter! See if it works normally and there is no fault code. Air flowmeter is also a problem part that is easily overlooked, which increases fuel consumption!