Add Yahoo as a preferred source to see more of our stories on Google. President Donald Trump announces changes to fuel economy standards that he said will save consumers a combined $109 billion over ...

Achieving elite status in fuel efficiency requires more than simple assembly; it demands a fundamental optimization of the combustion cycle. Modern industrial diesel engines achieve lower fuel burn ...

Don't want the hassle of an EV or the complexity of a hybrid? Then step this way because these gas-powered cars aren't just ...