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Adjusting tire pressure to the manufacturer's specification is a fundamental practice for maintaining optimal fuel economy. Properly inflated tires ensure that the vehicle has the best possible contact with the road, which can significantly reduce rolling resistance. When tires are under-inflated, they create additional friction and resistance, which forces the engine to work harder and consume more fuel. Conversely, if tires are over-inflated, it can lead to decreased traction and uneven wear, although this tends not to affect fuel efficiency as drastically as under-inflation does. Ensuring that tire pressure is at the level recommended by the manufacturer helps maintain safe driving conditions while also maximizing fuel efficiency, making it a vital method to keep costs down at the pump.

Regularly checking for signs of wear, rotating tires, and investing in higher-grade tires each have their own benefits, but these actions primarily focus on safety, longevity, and performance rather than directly impacting fuel economy as significantly as maintaining proper tire pressure does.