Do the Wings and Skirts on Semi-Trucks Add Efficiency? How Much?

My Answer: Depends on the setup, the situation, and the deployment. Most of those are worth anywhere from 3–10 percent efficiency gain via aerodynamics. Side skirts for the trailer, for example, can be 2–5 percent on some trailers, less on others. Adding things under the trailer doesn’t necessarily add onto the effect of skirts, but it can bolster their overall effect.

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