An inwardly disposed vehicle skirt panel assembly disposed laterally inset toward the longitudinal centerline of the vehicle. The vehicle skirt panel assembly is suspended underneath a rearward body component of a truck or semitrailer, extending forwards in front of a rearward wheel assembly. The vehicle skirt panel assembly stabilizes otherwise laterally displaced air passing under the central portion of the moving vehicle, further increasing the effective air pressure developed immediately behind the vehicle. Maintaining air generally static while passing under the vehicle increases the effective pressure developed immediately behind the vehicle to reduce drag thereon.