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The overhead valve design as compared to the L-head design can increase fuel efficiency by as much as ________.

  1. 15%

  2. 20%

  3. 25%

  4. 30%

The correct answer is: 25%

The overhead valve design compared to the L-head design can increase fuel efficiency by as much as 25%. This is because the overhead valve design allows for better airflow into the combustion chamber, leading to more complete combustion of the fuel-air mixture. This improved combustion efficiency results in better fuel economy, making the overhead valve design more fuel-efficient compared to the L-head design. Option C (25%) is the correct answer.