What does an odometer measure in a vehicle?

An odometer is a device located in a vehicle that specifically measures the total distance traveled by the vehicle over its lifetime. It records this distance as the vehicle is driven, typically through a cable or electronic system connected to the wheels. This measurement is crucial for various reasons, including monitoring maintenance schedules, determining the vehicle's value, and providing information for resale.

Unlike the other options, which pertain to different aspects of vehicle performance or operation, the odometer's primary function is focused solely on distance. Fuel efficiency relates to how many miles a vehicle can travel per gallon of fuel, which is not measured by an odometer. Speed is typically measured by a speedometer, which indicates how fast the vehicle is moving at any given moment. Engine temperature is monitored by a temperature gauge that provides readings on the engine's operational temperature, unrelated to distance traveled. In summary, the odometer's sole purpose is to track how far a vehicle has traveled, making "the distance traveled" the correct answer to the question.