A rectangular cartop carrier of \(1.6-\mathrm{ft}\) height, \(4.0-\mathrm{ft}\) length (front to back), and 4.2-ft width is attached to the top of a car. Estimate the additional power required to drive the car with the carrier at \(65 \mathrm{mph}\) through still air compared with the power required to drive only the car at \(65 \mathrm{mph}\).