Yes,
a car sitting in a driveway does have stored gravitational potential energy. Gravitational potential energy is associated with an object's position relative to the Earth's surface.
When the car is lifted or elevated above the ground, it gains gravitational potential energy because it has the potential to fall or move downward due to gravity.
This energy is stored until the car is allowed to move downhill or descend, at which point it can be converted into kinetic energy as the car moves. So, even when the car is stationary, it possesses gravitational potential energy based on its height above the ground.