What is the reason for the high fuel consumption of 0.8 displacement Le Chi?

There are many reasons for high fuel consumption, which may be caused by excessive carbon deposition in throttle, idle motor, intake valve, intake pipe and combustion chamber, spark plug and fuel nozzle. Because these carbon deposits will block the idle channel, the idle motor will be stuck or beyond its adjustment range, resulting in low idle speed, unstable idle speed, high fuel consumption and flameout. Frequent starting and stopping, frequent shifting, heavy throttle, and so on.