What if Highlander's fuel consumption increases?

For the question you asked, the reason of high fuel consumption may be that there are too many carbon deposits in the throttle, idle motor, intake valve, intake pipe and combustion chamber, spark plug, injector and other parts, which leads to high fuel consumption of the engine, so it must be thoroughly checked and cleaned. Also pay attention to check whether there is a fault in the carbon canister, which causes the mixture to be concentrated all the time when the engine is working, causing the mixture to be too rich 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! In addition, if there is something wrong with the oxygen sensor of your car, the engine computer will not be able to accurately control the fuel injection quantity, which will lead to an increase in fuel consumption. I hope my answer is helpful to you.