Back in 2004, several automakers got together to create a more pure form of gasoline to meet strict standards set by the U.S. Environmental Protection Agency (EPA), now known as Top Tier gasoline.

If you use low-quality gas without extra fuel additives and detergents, your fuel system and injectors will get dirty. Here’s how they work.

There are very few, very specific instances that would require the labor-intensive and expensive cleaning of a car's fuel tank. In fact, most cars made in the last 20 or so years should hardly require ...