Is Premium Gas 87-89 or 93?

Pull up to almost any gas station, and you’ll usually see three fuel options: 87, 89, and 91 or 93 octane. It’s a common question among drivers: is 89 premium gas? The short answer is no. In most parts of the United States, 89 octane is considered midgrade gasoline, while premium fuel is typically rated at 91 or 93 octane.

Understanding the difference between fuel grades can help protect your engine, improve performance, and prevent unnecessary trips to the pump. Here’s what you need to know before your next fill-up.

What Do 87, 89, and 93 Octane Mean?

Octane is a measure of gasoline’s ability to resist engine knock, also known as pre-ignition. The higher the octane rating, the more resistant the fuel is to igniting under pressure before the spark plug fires.

Here’s a quick breakdown:

• 87 Octane: Regular gasoline recommended for most everyday cars, trucks, and SUVs.
• 89 Octane: Midgrade gasoline that offers slightly better knock resistance than regular fuel.
• 91–93 Octane: Premium gasoline designed for high-performance, turbocharged, or high-compression engines.

While all three fuels power your vehicle, they aren’t interchangeable for every engine. The best choice is always the one recommended by your vehicle’s manufacturer.

Is 89 Premium Gas?

No. Although some drivers assume 89 is premium because it’s more expensive than regular gas, 89 octane is classified as midgrade fuel. Premium gasoline generally starts at 91 octane, with 93 octane being the most common premium option available at many gas stations.

Midgrade fuel sits between regular and premium, offering additional protection against engine knock without reaching the higher octane levels required by performance engines.

Does Premium Fuel Improve Performance?

Only if your engine is designed to use it.

If your owner’s manual recommends premium gasoline, using 91 or 93 octane allows the engine to perform as intended. You may notice smoother acceleration, better towing performance, and optimal horsepower because the engine can maintain its designed ignition timing.

However, if your vehicle is engineered for 87 octane, filling up with premium fuel typically won’t increase power, improve fuel economy enough to offset the higher price, or make your vehicle last longer. Modern engines are calibrated to perform best using the fuel grade specified by the manufacturer.

What Happens If You Use the Wrong Octane?

Using premium fuel in a vehicle that only requires regular gas generally won’t cause any harm. It simply costs more and usually doesn’t provide additional benefits.

Using 89 octane in a vehicle that requires premium is a different story. While modern engine computers can often adjust to lower-octane fuel temporarily, drivers may experience reduced performance, lower fuel efficiency, or engine knocking under heavy acceleration or towing. Repeatedly using a lower octane than recommended can place additional stress on the engine over time.

If you accidentally use the wrong fuel once, there’s usually no need to panic. Simply refill with the correct octane at your next fill-up and monitor your vehicle for any unusual noises or performance issues.

Which Fuel Grade Should You Choose?

For most drivers, the answer is simple: follow your owner’s manual.

• Choose 87 octane if your manufacturer recommends regular gasoline.
• Choose 89 octane only if your vehicle specifically recommends midgrade or if your owner’s manual lists it as an acceptable option.
• Choose 91 or 93 octane if your vehicle requires premium fuel for peak performance and engine protection.

Using a higher octane than recommended won’t necessarily improve your driving experience, but using a lower octane than required may reduce performance and increase the risk of engine knock.

Keep Your Vehicle Performing Its Best

So, is 89 premium gas? No, 89 octane is considered midgrade gasoline, while premium fuel is generally 91 or 93 octane. Choosing the correct fuel isn’t about buying the most expensive option; it’s about giving your engine exactly what it was designed to use.

If you’re ever unsure which fuel grade is right for your vehicle, check your owner’s manual or speak with a trusted service advisor. Following the manufacturer’s recommendation is one of the easiest ways to maximize performance, protect your engine, and enjoy confident driving for years to come.