How does tire pressure affect fuel efficiency in vehicles and what is the recommended pressure for optimal mileage?

Tire pressure affects fuel efficiency in vehicles by directly impacting rolling resistance. When the tire pressure is too low, more of the tire's surface area comes in contact with the road, increasing the friction and requiring more fuel to overcome the resistance. Conversely, when the tire pressure is too high, the center of the tire bulges out, resulting in less contact with the road and decreased fuel efficiency.

The recommended tire pressure for optimal mileage can vary depending on the vehicle make and model. However, a good rule of thumb is to follow the manufacturer's guidelines, which are often found on a sticker inside the driver's side door jamb or in the owner's manual. Keeping the tires inflated to the recommended pressure can help improve fuel efficiency, extend tire life, and ensure better handling and braking performance.