Which factor is essential for optimizing a truck’s fuel efficiency?

Proper tire pressure is essential for optimizing a truck's fuel efficiency because it directly affects the rolling resistance of the tires. When tires are inflated to the manufacturer's recommended pressure, they provide better contact with the road, reducing the amount of energy required to move the vehicle forward. Under-inflated tires create more drag, leading to increased fuel consumption as the engine has to work harder to overcome this resistance.

In addition to contributing to better fuel economy, maintaining proper tire pressure also enhances safety and tire longevity. It ensures better handling and reduces the risk of blowouts, which can occur with overly worn or improperly inflated tires. Therefore, keeping tire pressure at the ideal level is one of the simplest yet most effective ways to improve fuel efficiency in trucks.