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.

Premium gas can give some cars a boost, hyping performance and making sure the engine runs smoothly. But not every car can ...

If you've ever fueled up in Colorado, you might have noticed something unusual about the gas octane ratings at the pump – specifically, the availability of 85-octane gasoline. This lower octane fuel ...

We’ve been burning gasoline for well over a hundred years now, but some misconceptions about fuel—especially when it comes to octane—are so ingrained in the popular consciousness that even those of us ...

Gasoline is a mystery to most hot rodders. For the most part, we just fill up the tank and forget about the fuel. The most difficult question is whether to step up from 89 to 92 octane. As you might ...