Bora in 2003 was particularly expensive.

As for the question you asked, because you have never seen an existing car, the analysis may be that there are too many carbon deposits in the throttle, idle motor, intake valve, intake pipe, combustion chamber and fuel injector, which leads to high fuel consumption of the engine, so it must be thoroughly inspected and cleaned. Also pay attention to check whether there is a fault in the carbon canister, which causes the mixture to be too thick when the engine is working, which causes the mixture to be too thick when driving at low speed, resulting in high fuel consumption. Then, driving at low speed for a long time in urban areas will easily lead to an increase in fuel consumption and the formation of carbon deposits. You should pay attention to this! If conditions permit, you can run high-speed regularly, which can slow down the formation of carbon deposits. Besides, your car has been driving for more than 7 years, and there should be wear inside the engine, which will also lead to a decrease in engine power and an increase in engine fuel consumption. I hope my answer is helpful to you.