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.

For heavy duty pickups and vans sold, the average is expected to be 35 miles per gallon — by ... metric tons of climate pollution out of our air. That is the equivalent of taking more than ...

the number isn’t in miles per gallon (MPG), but was given as miles per gallon gasoline equivalent, or MPGe. A new term to the automotive lexicon, it’s worth exploring exactly what MPGe means ...