When to use overdrive for 1999 Mitsubishi montero?

In a 1999 Mitsubishi Montero, you should use overdrive when driving at higher speeds on the highway or on flat terrain to improve fuel efficiency and reduce engine strain. Overdrive allows the transmission to shift into a higher gear, lowering engine RPMs. Avoid using overdrive in situations that require more power, such as towing, climbing steep hills, or during heavy acceleration, as it may cause the engine to struggle or reduce performance.