What Is the Difference Between 91 and 95 Octane Gasoline? Which One Should You Use?

What does the octane number mean?

The octane number, also known as the octane rating, is a measure of gasoline quality or performance. The higher the number, the more efficiently fuel burns in a vehicle’s engine. Higher octane fuels are required for high-performance vehicles. The fuel octane rating is about how much knock resistance the fuel has. It is about how it burns in a controlled way under pressure when it is heated. Fuels with higher octane levels, like 95 octane, resist autoignition better than low-octane fuels.  

What is the difference between octane 91 and 95?

The difference between the 91 and 95 octane is the 4% change in the octane levels. Octane 95 gasoline is more flammable and lighter than 91 gasoline. The internal combustion engine performs better with higher octane numbers. Besides quality, price is an important differentiator. Higher-octane rated gasoline is typically more expensive than lower-rated gasoline. Any vehicle that runs on 91 octane can run on 95 octane, but not the other way around.  

See: The Latest Fuel Prices in Saudi Arabia

Which octane number should you use?

Before deciding what type of fuel to use in your vehicle, you should refer to your owners manual, or ask the dealer or manufacturer of your vehicle. The type of fuel you should use is usually printed on the inside of the fuel cap of most vehicles. When making the decision, a lot of different key factors go into choosing the right fuel for your vehicle. In most cases, fuels with a higher octane rating are commonly used in cars with high-compression engines that have higher performance requirements, like what is in race cars. Please always keep in mind that putting a lower octane fuel in an engine that requires higher octane levels can cause permanent damage to your vehicle.  

You have to use the optimum fuel for your vehicle to get the most horsepower and torque. If you are buying fuel for racing, or have a high combustible engine, then you need a higher percentage of octane in your fuel. Racers and car enthusiasts alike have to think about what goes in their tanks. If they put the wrong fuel in their car, it could have detrimental effects on their car’s engine and performance. The same exact thing can be said for our everyday cars too.  

Does higher octane fuel give you better fuel efficiency?

If you have a high-performance engine, like what you would see in a race car, then yes. If you have the need for high performance, and you have the right equipment to use that boost, then it will do exceptionally well. If you put a higher octane fuel in an everyday car, it will not give it any extra power or performance, because the engine isn’t made for it. You would pay extra money for no extraordinary output. 

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