Final answer:
The gear used for starting the engine and disengaging it from the drive wheels is neutral.
Step-by-step explanation:
The gear used for starting the engine, disengaging the engine from the drive wheels is neutral. In neutral, the transmission is disconnected from the drive wheels, allowing the engine to run or be started without causing the vehicle to move. To ensure safety and prevent the vehicle from moving unintentionally, always make sure the car is in neutral or park before attempting to start the engine.