What is an overdrive in a Toyota Previa?

In a Toyota Previa, overdrive refers to a driving mode that allows the vehicle to operate at lower engine RPMs at higher speeds, which can improve fuel efficiency and reduce engine wear. When engaged, overdrive typically shifts the transmission to a higher gear, allowing for smoother highway cruising. Drivers can activate or deactivate overdrive using a button or switch, depending on the model year. It's beneficial for long-distance driving but may not be ideal for towing or hilly terrain, where more power is needed.