Why does the odometer stay on?

The odometer in a vehicle remains on while the engine is running to continuously track the distance traveled. It relies on power from the vehicle's electrical system, which is active when the ignition is turned on. This allows drivers to monitor mileage in real-time, which is essential for maintenance schedules and fuel efficiency calculations. Additionally, some modern vehicles keep the display active for a short period after the engine is turned off to provide relevant information before fully powering down.