Learn when premium fuel is actually required, what the different grades mean, and how to avoid paying too much.

TOP TIER™ gas is gasoline (and also diesel fuel when applicable) that has been certified to meet specific performance standards. A group of automakers — Volkswagen, Toyota, Honda, General Motors, BMW, ...

Misfueling a gasoline car with diesel is one of those mistakes that goes from embarrassing to expensive in a matter of minutes. The wrong fuel can damage components from the tank to the catalytic ...

In the middle of the U.S. summer driving season, diesel is knocking gasoline off its perch as the hot fuel bet and has become one bright spot in an oil market bracing for a glut this year. U.S. diesel ...