This trailer undertray device actually acts as a trailer end fairing. The manufacturer claims it redirects airflow from beneath the trailer up into the area of low pressure that forms behind the trailer when the vehicle is in motion, thus reducing the pressure differential and the aerodynamic drag produced by that partial vacuum. The manufacturer claims a 5.5% improvement in fuel economy.
This trailer undertray device actually acts as a trailer end fairing. The manufacturer claims it redirects airflow from beneath the trailer up into the area of low pressure that forms behind the trailer when the vehicle is in motion, thus reducing the pressure differential and the aerodynamic drag produced by that partial vacuum. The manufacturer claims a 5.5% improvement in fuel economy.
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