US Patent 10953932 Multicomponent improved vehicle fuel economy system

A semitrailer comprising a main frame having a hitch, an axle assembly connected to the main frame, the axle assembly including at least two wheels for rotation relative to the main frame, a fairing connected to an underside of the semitrailer intermediate the hitch and the axle assembly, the fairing including a pair of lateral surfaces, a bottom surface spaced from the underside of the semitrailer, and a leading surface, wherein the leading surface includes an intake opening, and wherein at least one of the bottom surface or the lateral surfaces includes an exit opening, and a flow path fluidly connects the intake opening and the exit opening.