Practice question

How does tyre pressure affect fuel economy?

  1. Higher pressure reduces fuel economy
  2. Under-inflated tyres increase rolling resistance, increasing fuel consumption by up to 3% per 10% under-inflation
  3. Pressure has no measurable effect on fuel use
  4. Fully inflated tyres increase fuel use due to reduced traction

Answer: B — Under-inflated tyres increase rolling resistance, increasing fuel consumption by up to 3% per 10% under-inflation

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