sentences:  With a Cd of only 0.27 and a frontal area of 14 ft² the 3.0L engine was sufficient to push the P68 to over 350 km/h, faster than contemporary Formula One cars.However, former driver Frank Gardner has criticised Bailey's pursuit of aerodynamic efficiency at the expense of driver comfort.In order to keep the P68 on the road, Bailey incorporated a patented, vortex-generating tail scoop, intended to create downforce without adding to drag.