Cab extender systems and methods are provided for reducing the aerodynamic drag on a pickup truck. A cab extender system includes a cab with a roof panel and a rear wall. The cab extends upward on the vehicle to the roof panel and the rear wall extends downward from the roof panel. A tailgate is disposed at a rear of the vehicle and a utility box extends between the rear wall and the tailgate. An extender extends in a rearward direction from the roof panel a length of between ten and twenty centimeters from the rear wall.