2. Dirty air filter: A dirty air filter can restrict airflow to the engine, which can reduce fuel efficiency. Replace your air filter according to the maintenance schedule in your owner's manual.
3. Faulty oxygen sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gases and helps the engine adjust the fuel mixture. A faulty oxygen sensor can cause the engine to run rich and waste fuel.
4. Clogged fuel injectors: Clogged fuel injectors can cause the engine to run rough and waste fuel. Have your fuel injectors cleaned or replaced if necessary.
5. Faulty spark plugs: Faulty spark plugs can cause the engine to misfire, which can reduce fuel efficiency. Replace your spark plugs according to the maintenance schedule in your owner's manual.
6. Leaking vacuum hose: A leaking vacuum hose can cause the engine to run lean and waste fuel. Inspect all of the vacuum hoses under the hood for cracks or leaks and replace them if necessary.
7. Faulty thermostat: A faulty thermostat can cause the engine to run at too low of a temperature, which can reduce fuel efficiency. Replace the thermostat if necessary.
