Regular v/s High Octane Gasoline

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Regular v/s High Octane Gasoline for our car. Octane rating is nothing but a grade assigned keeping in mind the performance of the fuel. If we discuss the engines of the car, low octane fuel is generally sufficient to prevent the knocking. The most popular choice in terms of octane gasoline is 87 octane gasoline. This is most popular among motorists and is the minimum rating for such engines.


There is a common misconception that high octane gasoline gives any car an extra horsepower. There is a difference between regular octane and high octane. The use of high octane does not mean it is always beneficial. It is a misinterpretation that people think when they compare regular octane to high octane gasoline.


The price of gasoline is not constant and keeps on changing. Generally, regular gasoline is cheaper than high octane gasoline. Because of this reason, many people choose regular gasoline despite high octane gasoline. The people who have short term vision. They don’t think and consider the long term effects. They just have the tendency to save a few bucks.

There is a minimum requirement and that too specific for every engine. If we design a car in such a way that the minimum octane requirement is 93. If we chose 91, it may not be optimum and moreover less likely to cause engine knocking.

It is also important to understand that regular octane gasoline does not mean low quality of fuel. Instead, high octane gasoline generally contains certain extra additives under certain situations. If we consider the commercial vehicle, the owner’s manual recommendation is 87. So there does not arise any reason to upgrade the gasoline when the engine itself does not require the same.


High octane gasoline does not turn the small hatch pack to a racing car. The main difference is high octane gasoline has the tendency to withstand high pressure before auto-ignition. High power engines tend to operate at a high compression ratio. This is the reason car with high compression ratio requires premium gasoline or high octane gasoline.

High octane engines are more stable in comparison to regular gasoline. They are able to withstand pressure. But at the same time, it does not make your engine more powerful.

Use Higher Octane than Recommended

High octane gasoline is usually a popular choice among people. If you are using an old engine there is a probability of high octane rating. This is due to carbon deposits that accumulate over the years. This generates the need for fuel that can handle high pressure.

Thus instead of buying a new car and paying more for fuel. We should rather continue using the old car a few more miles at the same cost.

Using Lower Octane than Recommended

If we use lower octane it may cause harm to engine knocking. Pre-detonation is due to the auto-ignition of lower octane gas when we operate at higher compression. This can even lead to the overheating of engines and leads to melting pistons.

In the end, we can identify there is no way of using a car with cheaper or expensive gasoline than the recommendation. The comparison made between regular v/s high Octane Gasoline.

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