All gasoline contains octane, the level of which informs how it burns in the engine of your car. Higher-octane fuel is usually better at preventing issues that can damage your engine over time.

Top Tier gasoline must contain more deposit-fighting detergents, it also must be sold at all of a fuel marketer’s stations and across all grades of its gasoline, from 87-octane regular to top-of ...

And since Costco’s gas prices are as good as the rest of its prices, it should come as no surprise that Costco also sells a lot of gas. In fact, in 2024 alone, Costco sold a whopping $30 billion ...

Second, you can measure it at higher engine speeds, called the motor octane number (MON). The standard rating consists of an average of the RON and MON ratings; this is why gas pumps often display ...

Fuel quality can have a slight impact on the weight of gasoline. Gas stations in the U.S. sell three primary grades of gasoline based on the octane level: Regular (the lowest-grade octane fuel – ...

How To What is the best octane gasoline for my vehicle? John Paul, AAA Northeast's Car Doctor, answers a question from a reader wondering whether they need to follow the manufacturer’s gasoline ...