How does a clogged air filter affect fuel efficiency?

• It can reduce fuel efficiency by 10%.
  Explanation:

  "A clogged air filter restricts airflow to the engine, which can cause it to work harder, leading to a reduction in fuel efficiency of up to 10%. Regularly replacing or cleaning the air filter helps maintain optimal fuel efficiency and engine performance."
• It can reduce fuel efficiency by 20%.
• It can reduce fuel efficiency by 30%.
• It can reduce fuel efficiency by 40%.