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Difference between 87 and 91 Octane Gas

Difference between 87 and 91 Octane Gas

If you’re like most drivers, you probably think that all octane ratings are the same. However, this isn’t actually the case. In fact, there is a significant difference between 87 and 91 octane gas. Wondering what that difference is? Keep reading to find out!

What is 87 Octane Gas?

  • 87 octane gas is a fuel that is typically used in automobiles. It is a petroleum-based product that is refined from crude oil. 87 octane gas is composed of hydrocarbons, which are molecules that contain carbon and hydrogen atoms.
  • The octane rating of a fuel refers to its ability to resist “knocking” or “pinging” during combustion, which can cause engine damage. 87 octane gas has an octane rating of 87, which means it is less likely to cause knocking than lower-octane fuels. 87 octane gas is also known as “regular” gas, as opposed to “premium” gas, which has a higher octane rating.
  • Premium gas is typically more expensive than regular gas and is not always necessary for most vehicles. However, some vehicles require premium gas in order to run properly. Consult your vehicle’s owner’s manual to determine if 87 octane gas is right for your car.

What is 91 Octane Gas?

91 octane gas is a fuel that is used in high-performance cars. It has a higher octane rating than regular unleaded gas, and this allows it to resist “knocking” or “pinging” during combustion. As a result, 91 octane gas can provide more power and better fuel economy for high-performance vehicles.

In addition, 91 octane gas can also help to extend the life of engine components by reducing wear and tear. For these reasons, 91 octane gas is the preferred choice for many driving enthusiasts. So if you’re looking for a little extra power and efficiency, be sure to fill up with 91 octane gas.

Difference between 87 and 91 Octane Gas

87 and 91 octane gas are two types of unleaded petrol. 87 octane gas is the most common type of unleaded petrol and is suitable for most vehicles. 91 octane gas is a higher quality fuel that provides better performance and is typically used in high-performance vehicles.

87 octane gas is less expensive than 91 octane gas, so it is often the preferred choice for budget-minded drivers. However, if you have a high-performance vehicle, you may notice a difference in how your vehicle performs when using 91 octane gas.


The octane rating of a fuel is essentially how heat resistant it is. The higher the octane number, the greater the fuel’s resistance to “knocking” or “pinging” during combustion, caused by the air/fuel mixture detonating prematurely in the engine. In North America, unleaded gasoline typically comes with octane ratings of 87. However, many high-performance cars require 91 octanes or higher for optimum performance.

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