Final answer:
Inflating a tire can improve gas mileage.
Step-by-step explanation:
When an inflated tire affects the gas mileage, it increases the gas mileage. When more gas fills the tire, the pressure increases due to more frequent collisions, which compresses the gas into a smaller volume. This, in turn, increases the molecular collisions and the pressure. Most manufacturers specify the optimal tire pressure for cold tires, and maintaining the recommended tire pressure can improve gas mileage.