Correct answer
Yes, it can help when suitable and correctly adjusted.
Yes. It can reduce aerodynamic drag and fuel use under the conditions for which it was designed. Results depend on vehicle, adjustment, load, speed and use; no saving percentage is guaranteed for all vehicles. Not every spoiler or wing serves that purpose: some increase drag or serve aesthetic or downforce functions. Use suitable devices and follow manufacturer guidance.
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All options
No, all deflectors are purely decorative.
Yes, it can help when suitable and correctly adjusted.
It can affect only rigid lorries, never combinations.
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