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Question 5606

When is fuel consumption higher in a vehicle's engine?

  1. When the air intake to the engine is blocked.
  2. When air mixes with the fuel.
  3. The vehicle always has the same fuel consumption.
Show answer and explanation

Correct answer: When the air intake to the engine is blocked.

If the air intake is blocked, for example by a dirty filter, less air reaches the engine to burn the fuel. The engine loses power and may use more fuel to do the same work. Air mixing with fuel is normal in any engine, and fuel consumption varies with how you drive and the car's condition. In the image, the air filter is full of leaves.

Effect of Intake Air Filter Condition on Vehicle Fuel Economy