Correct answer
Yes, because it avoids the rack’s added aerodynamic drag.
Yes. Even empty, it can increase aerodynamic drag and fuel consumption, so removal when unused helps avoid that cost. The change depends on the vehicle, rack and speed; no single percentage applies to every case. Follow manufacturer instructions for removal.
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No, because every roof rack guarantees greater stability.
Yes, because it avoids the rack’s added aerodynamic drag.
It makes no difference because a roof rack never affects consumption.
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