Sean Duffy took aim at the main way the federal government regulates miles per gallon for cars and pickup trucks — also a principal way that it regulates air pollution and addresses climate change.

Explore the truth about summer gasoline: why its blends raise prices yet reduce pollution. Uncover trade-offs in fuel and air ...

The proposed sulfur standards will cost refineries less than a penny per gallon of gasoline on average once ... 1 in 3 Americans live in areas where air pollution levels exceed at least one ...