Systems and methods for diverting airflow around a vehicle during forward motion are disclosed, having at least one inlet orifice, at least one duct, the at least one duct in fluid communication with the at least one inlet orifice, at least one outlet orifice, and a tailcone assembly having a rearwardly facing, convexly projecting rounded surface, the tailcone assembly abutting the rear surface of the vehicle, the outlet located on the rearwardly facing, convexly projecting rounded surface, the tailcone assembly defining an internal cavity, the at least one internal cavity in fluid communication with the at least one outlet orifice and the at least one duct. Further improvements adapted to encourage laminar flow about a land vehicle when in motion are also disclosed.