The drag coefficient (Cd) of a semi-tractor trailer without a cab fairing is 0.96,and with the fairing is 0.76 based on frontal area of 80ft^2. if power=Force * velocity, determine the horsepower (Hp) reduction of using the fairing in the truck is going 60 mph (88fps). Assume the density of the air p= 0.072 lbm/ft^3