Correct answer
Yes, and they can increase consumption, especially at higher speed.
Yes. Open windows alter airflow and can increase aerodynamic drag and fuel consumption, especially at higher speed. They are not a general fuel-saving measure. Ventilate appropriately and maintain a safe temperature; air conditioning also uses energy, so no method guarantees savings in every situation.
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No, they never change aerodynamics or consumption.
Yes, but they always reduce consumption at higher speed.
Yes, and they can increase consumption, especially at higher speed.
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