Correct answer
Approximately 5%, as an indicative reference.
IDAE cites 5% as an indicative figure in its car-use advice. Fully open windows can increase aerodynamic resistance. This does not mean consumption rises by exactly 5% for every vehicle and situation: the actual effect depends on factors including speed, vehicle and window opening.
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Approximately 5%, as an indicative reference.
20% as the figure in that advice.
30% as the figure in that advice.
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