the turbulent flow delays the separation of the flow behind the vehicle or behind the trailer 100 the result of this delay in separation of the air flow is a decrease in the form drag also called pressure drag exerted on the vehicle 100 or the trailer 104 with less drag on the vehicle 100 or trailer 104 less energy is needed to move the vehicle or trailer forward this ultimately leads to increased fuel efficiency of the engine that moves the vehicle 100 or trailer 104 it should be noted that for other embodiments bumps or protuberances rather than dimples may be used to achieve similar results in particular the sheets 302 may contain bumps on them instead of dimples alternatively bumps may be attached directly onto the side of a vehicle 100 or trailer 104 it should further be noted that the various embodiments described may be implemented on watercraft aircraft and other objects recreational objects unmanned objects etc for embodiments where a dimpled surface is implemented directly onto the surface of a motor vehicle 100 the dimpled surface can be implemented at the time of manufacture of the vehicle or trailer for instance when the trailer of a heavy duty tractor trailer is being manufactured a group of dimples can be applied to the surface of the trailer alternatively when the trailer of a heavy duty tractor trailer is being manufactured a group of dimples can.