Close shot of gas pump showing various grades of gas available - Joe Raedle/Getty Images The next time you refuel, you may notice several different grades of gasoline for sale. You are probably ...

87 octane gasoline, often called "regular" gas, is one of the most commonly used fuels in the United States. But what gives it that 87 rating is a word you've probably heard a time or two: Ethanol.

What's the difference between a sports car and the lawn mower sitting in your garage? Of course there are many differences, but we'll give you a hint on a key point: One works with either 87 or 93 ...

DENVER — Unless you have a turbocharged engine, regular 85 octane fuel may be the most expensive gas purchase you need. But for more miles per gallon, 87 octane may be the better buy than 91 octane ...

We see the numbers every day at the local gas station, with gas sold based on octane ratings. Most people go to the lower number—usually 87—because it’s the cheapest, but what do the ratings mean, ...

If you're a new driver, you may be confused the first time you pull up to the gas station. Most pumps offer a selection of fuel types labeled with a number. Those numbers aren't the price but rather ...