What is a common indicator of engine overheating?

An engine temperature gauge showing high readings is a clear and common indicator of engine overheating. The temperature gauge is designed to monitor the engine's operating temperature and will provide a direct visual indication of any rise above the normal operating range. When the engine overheats, it can lead to severe damage, including warping of engine components, blown gaskets, or even a complete engine failure.

Increased fuel efficiency, low battery voltage, and excessive tire wear are not direct indicators of engine temperature. Increased fuel efficiency is typically a sign of optimal engine performance rather than overheating. Low battery voltage indicates electrical issues that may not necessarily relate to the engine's thermal state. Excessive tire wear, while a concern for vehicle maintenance and safety, does not directly correlate with engine overheating but could result from other mechanical problems or improper alignment. Therefore, monitoring the engine temperature gauge is crucial for ensuring the engine operates within safe temperature limits.