What is the reason for the increase in fuel consumption after the disassembly of the new Qi Jun engine?

Hello, in addition to the wrong driving habits, fuel consumption will also increase, such as the aging of engine spark plugs and low tire pressure. For example, spark plugs, once aging, will affect the full combustion of gasoline, and will definitely consume more oil than before. Too low tire pressure will not only affect handling, but also increase resistance and fuel consumption. In addition, the throttle and injector are dirty, so it is best to clean them every 20,000 kilometers, which will help reduce fuel consumption.