What is an acceptable loss rate for air pressure in a single vehicle within one minute?

Answer: C — Less than two psi

An acceptable loss rate for air pressure in a single vehicle within one minute is less than two psi. Maintaining proper tire pressure is crucial for safety, fuel efficiency, and overall vehicle performance. A loss rate below this threshold indicates that the tires are in good condition and that there are no significant leaks or issues affecting air retention. Tires that lose air more rapidly can compromise vehicle control, increase stopping distances, and lead to premature tire wear. Therefore, monitoring the air pressure loss rate is an important part of vehicle maintenance. The standard reflects a balance between ensuring safety and recognizing normal wear or minor leaks that can occur over time in tires.