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 ...

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.