What is the Difference Between 91 95 and 98 Petrol

The main difference between 91 95 and 98 petrol is that 98 and 95 petrol have a greater resistance to engine knocking than 91 petrol.

Petrol, commonly known as gasoline, is a fuel widely used in internal combustion engines, such as those found in cars and motorcycles. 91, 95, and 98 petrol represent different octane ratings of gasoline commonly available at fuel stations. These numbers indicate the fuel’s resistance to knocking or premature ignition in an internal combustion engine. The higher the octane rating, the greater the resistance to knocking.

Key Areas Covered

1. What is 91 Petrol
      – Definition, Features
2. What is 95 Petrol
      – Definition, Features 
3. What is 98 Petrol
      – Definition, Features 
4. Similarities Between 91 95 and 98 Petrol
      – Outline of Common Features
5. Difference Between 91 95 and 98 Petrol
      – Comparison of Key Differences
6. FAQ: 91 95 and 98 Petrol
      – Frequently Asked Questions

Key Terms

91 Petrol, 95 Petrol, 98 Petrol

Difference Between 91 95 and 98 Petrol - Comparison Summary

What is 91 Petrol

The term “91 petrol” refers to a specific octane rating, a measure of the fuel’s resistance to premature combustion. In this context, 91 octane petrol is a type of unleaded gasoline with an octane rating of 91. Higher octane ratings generally imply better performance and efficiency in certain high-performance or turbocharged engines. However, not all vehicles require or benefit from higher octane fuels. Most standard automobiles run efficiently on fuels with octane ratings within the recommended range specified by the manufacturer.

 91 vs 95 vs 98 Petrol

The refining process determines the octane rating, with higher octane fuels often being more refined and containing additives to prevent engine knocking. It’s crucial for vehicle owners to use the appropriate octane level as per their vehicle’s requirements, balancing performance and cost-effectiveness.

What is 95 Petrol

95 petrol, commonly known as unleaded petrol with an octane rating of 95, is a widely used automotive fuel. Unleaded petrol contains no lead additives, contributing to a cleaner combustion process and reducing harmful emissions.

This fuel type is compatible with most modern vehicles equipped with spark ignition engines. Its popularity stems from its balance between performance and cost. While higher octane fuels exist, 95 petrol strikes a practical compromise, providing sufficient anti-knock properties without a significant price increase.

In addition to its role in powering internal combustion engines, 95 petrol has implications for environmental sustainability. As automotive technology advances, manufacturers continue to develop engines that maximize efficiency and minimize pollution. The use of unleaded petrol aligns with these goals, promoting cleaner air quality and reducing the environmental impact of transportation.

What is 98 Petrol

Petrol, with a 98 octane rating, is a high-octane fuel that is often associated with premium or performance-oriented vehicles.  A higher octane rating, such as 98, indicates greater resistance to these issues.

Vehicles equipped with high-performance engines, turbochargers, or superchargers may benefit from 98 petrol. The higher octane helps prevent premature ignition of the fuel-air mixture, allowing these engines to operate at peak efficiency and performance. While standard engines can run on lower-octane fuels without issues, some enthusiasts and sports car owners prefer the superior combustion characteristics and potential performance gains associated with 98-octane fuel.

Compare 91 95 and 98 Petrol

It’s important to note that using a higher octane fuel than recommended by the manufacturer does not necessarily enhance performance in regular vehicles. The choice of petrol should align with the engine’s requirements, as specified in the owner’s manual. Additionally, regional variations and fuel standards can impact the availability and characteristics of 98 petrol in different markets.

Similarities Between 91 95 and 98 Petrol

  • All three petrol grades (91, 95, and 98) consist of hydrocarbons derived from crude oil.
  • They are all types of unleaded petrol with different octane ratings.
  • 91, 95, and 98 petrol are commonly available at fuel stations

Difference Between 91 95 and 98 Petrol


91 petrol has an octane rating of 91, indicating a lower resistance to knocking, while 95 petrol features an octane rating of 95, providing a moderate resistance to knocking. 98 petrol has the highest octane rating among the three, offering superior resistance to knocking.


Moreover, 91 petrol is suitable for regular cars and engines with lower compression ratios. 95 petrol is a mid-range option suitable for a variety of vehicles, providing a balance of performance and cost, while 98 petrol is recommended for high-performance and premium vehicles with advanced engines, offering optimal performance and efficiency.

Engine Compatibility

91 petrol is compatible with most standard engines, while 95 petrol is suitable for a broad range of engines, including those with moderate performance demands. On the other hand, 98 petrol is best suited for high-performance engines and vehicles that require superior fuel quality.


91 petrol is typically the least expensive of the three. 95 petrol is priced between 91 and 98 petrol. Meanwhile, 98 petrol is generally the most expensive due to its higher octane rating and enhanced performance characteristics.

Fuel Efficiency

91 petrol may result in slightly lower fuel efficiency compared to higher-octane options, while 95 petrol offers a balance between performance and fuel efficiency. However, 98 petrol can contribute to optimal fuel efficiency, especially in engines designed for higher-octane fuels.

FAQ: 91 95 and 98 Petrol

Is 98 petrol better than 91?

Yes, 98 petrol can be better than 91 because the higher the number the better the fuel.

Does 98 burn slower than 91?

All grades of pump gas burn at the same rate. High octane resists detonation.

What happens if you mix 91 and 98 fuel?

Mixing unleaded petrols of different octane ratings isn’t a problem, as long as you observe the manufacturer’s minimum requirements.


91 petrol has a lower resistance to knocking, while 95 petrol has a moderate resistance to knocking, and 98 petrol has the highest octane rating among the three, offering superior resistance to knocking. Thus, this is the main difference between 91 95 and 98 petrol.


1. “Which petrol should you use? The different fuel types explained.” Savings.com

Image Courtesy:

1. “Close-Up Photo Gasoline Fuel Pump” (CC0) via Pexels
2. “Person Putting Gasoline on a Vehicle” (CC0) via Pexels

About the Author: Hasini A

Hasini is a graduate of Applied Science with a strong background in forestry, environmental science, chemistry, and management science. She is an amateur photographer with a keen interest in exploring the wonders of nature and science.

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