A late-model Hummer has a frontal profile area of 3.1 m2 and a CD of 0.47. It is moving at a steady speed of 75 mph. a) If we ignore bearing friction, rolling resistance and "Johnny Law", how much power (in English units of hp) is needed at the wheels on level ground? b) If the engine/drivetrain efficiency (from fuel to the driving wheels) is 34 %, and the heating value of the gas is 44.5 MJ/kg, how much gas will we be using in gallons/hour?