An air drag reducing apparatus for use with a vehicle having a rear end closed by a pair of doors consists of a rectangular shaped panel having a leading edge hingedly connected to the vehicle, the panel extending at about 16 degrees relative to the rearward projection of a side of the vehicle in a drag reducing position. As the door is opened, an element allows the panel to be moved between the door and the side of the vehicle to a position adjacent the side of the vehicle. As the door is moved back from the opened position to a closed position, the element causes the panel to return to its drag reducing position. The rear of a vehicle includes two side panels and two top panels.