California is aiming to increase vehicles’ fuel efficiency by reducing energy loss from deformed tires.
The state Energy Commission last week proposed putting a fuel efficiency label on the top 15 percent of tires with the lowest rolling resistance within their size and load class.
The rulemaking is in response to a 2003 law, A.B. 844, which requires the development of reporting requirements for tire manufacturers and a rating system for comparing tires’ fuel economy. If 6.75 million Californians replace their tires each year, the commission says, a 10 percent change in rolling resistance can improve fuel efficiency up to 2 percent and save 300 million gallons per year statewide. That is worth $30 per year for a mid-size car.