California just became the first state to address a problem most people don’t know they have: inefficient tires. When automakers design a new vehicle, low rolling resistance tires are one of the least expensive ways to improve fuel economy. But they must eventually be replaced, and experts say ...
Source: [Grist](https://grist.org/transportation/californias-new-tire-efficiency-rules-could-save-drivers-1b-a-year/)