Can Gasoline 91 and 95 Be Mixed?

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When it comes to fuel in Thailand, many people wonder, "Can gasoline 91 and 95 be mixed?"

This is especially common in situations where you need to refuel but the nearby gas station doesn’t have your usual type of fuel. In this article, we will explore the answer and understand how this might affect your vehicle.

What Are Gasoline 91 and 95?

Gasoline 91 and 95 differ primarily in their octane rating, which indicates the fuel's ability to resist knocking or premature combustion in the engine.

• Gasoline 91: Has an octane rating of 91 and is suitable for engines with moderate compression ratios.
• Gasoline 95: Has an octane rating of 95 and is ideal for high-compression or high-performance engines.

A higher octane rating reduces the likelihood of knocking in the engine, leading to more efficient combustion and minimizing potential damage.

Can Gasoline 91 and 95 Be Mixed?

The answer is "YES", they can be mixed without immediately harming the engine. Both types are designed for use in gasoline engines. However, the resulting octane level will fall somewhere between 91 and 95, depending on the mixing ratio. For example, a 50:50 mix would yield an average octane rating of around 93.

Things to Consider When Mixing

Engine Type

If your engine requires a high-octane fuel like 95, using lower-octane fuel like 91 or mixing them to lower the octane level may cause knocking, which can affect performance and reduce the engine's lifespan.

Emergency Situations

Mixing gasoline 91 and 95 should be done only when necessary, such as when a gas station doesn’t have 95 and you need 91 to keep your vehicle running.

Long-Term Usage

Whenever possible, stick to the fuel type recommended by the manufacturer to maintain your vehicle’s performance and longevity.

Effects of Mixing

• Mixing gasoline 91 and 95 may not have immediate adverse effects if the octane level remains above the engine’s requirement.
• However, consistently using fuel with an octane rating lower than recommended can lead to engine knocking, reducing efficiency, and potentially causing long-term damage.

Gasoline 91 and 95 can be mixed, but it should be limited to emergencies and avoided as a regular practice. A lower octane rating may impact engine performance. To ensure the best care for your engine and maintain optimal performance, always use the fuel type recommended by the manufacturer!

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