Which tire condition is known to increase rolling resistance and reduce tread life?

Underinflation is the condition that significantly increases rolling resistance and reduces tread life. When tires are underinflated, they lack the necessary pressure to maintain their shape and effectiveness. This results in a larger contact patch on the road, leading to greater friction and heat buildup as the tire rolls. The increased rolling resistance means that more energy is required to move the vehicle, which can reduce fuel efficiency.

Moreover, underinflation causes uneven wear on the tire tread. The outer edges of the tread may wear down more quickly than the center, leading to shortened overall tread life. This not only leads to more frequent tire replacements but also poses a safety risk, as underinflated tires can adversely affect handling and braking performance.

Therefore, maintaining proper inflation is crucial for optimal tire performance, longevity, and vehicle safety.