Practice question

How does driving with an empty roof rack or cargo roof box (krovni kofer) affect vehicle efficiency?

Increases aerodynamic drag and raises fuel consumption by up to 10–20% at highway speeds
Decreases fuel consumption because of aerodynamic downforce
Improves braking distance by 5 metres
Has zero impact on fuel consumption or aerodynamics

Answer: A — Increases aerodynamic drag and raises fuel consumption by up to 10–20% at highway speeds

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