With fuel prices rising, some drivers in the Gulf are tempted to mix regular 91-octane gasoline with premium 95-octane to cut costs. But according to a report from Best Car Web, this practice can be more expensive than you think, potentially damaging your engine and voiding warranties.
With fuel prices rising, some drivers in the Gulf are tempted to mix regular 91-octane gasoline with premium 95-octane to cut costs. But according to a report from Best Car Web, this practice can be more expensive than you think, potentially damaging your engine and voiding warranties.
Why do some cars require premium fuel?
High-compression engines need higher octane fuel to prevent knocking (pre-ignition) that can destroy the engine. Using lower octane fuel leads to irregular combustion, reducing efficiency and causing long-term damage. In the Gulf’s hot climate, the risk increases because higher temperatures can exacerbate knocking.
What happens when you mix 50% regular with 50% premium?
Mixing half a tank of premium (95 octane) with half regular (91 octane) results in an average octane rating of about 93. This may not be sufficient for high-performance engines, especially under heavy load or in hot weather. The result: subtle knocking, loss of torque, and increased fuel consumption.
Does it really save money?
Even though regular fuel is cheaper, the drop in engine efficiency can negate any savings. Incomplete combustion can also lead to carbon deposits that damage oxygen sensors and catalytic converters, resulting in costly repairs. For example, a typical repair for a clogged catalytic converter in Saudi Arabia can cost between SAR 2,000 and SAR 5,000.
Long-term risks to your engine
Continuing to mix fuels can cause:
- Carbon buildup on valves and pistons
- Premature wear of spark plugs
- Reduced engine lifespan
- Voided warranty on modern cars, as manufacturers explicitly recommend using the specified fuel grade
What do manufacturers recommend?
All automakers recommend using only the recommended fuel. Any deviation can affect performance and emissions. Some cars equipped with knock sensors can temporarily adjust timing, but this reduces power and increases heat, further stressing the engine in Gulf temperatures.
Are there safe alternatives to save fuel?
Instead of risking engine damage, consider these safe methods:
- Use premium fuel from trusted stations
- Maintain proper tire pressure and regular engine service
- Reduce load and practice economical driving
In the end, mixing fuels is not a smart way to save money; it can be costly in the long run. Stick to the fuel specifications recommended for your vehicle.
Frequently Asked Questions
Does mixing regular and premium fuel damage the engine?
Yes, it can cause engine knocking, carbon buildup, and reduced engine lifespan, especially in high-performance cars. In the Gulf's heat, the risk is higher.
What octane do you get when mixing half regular and half premium?
You get approximately 93 octane, which is lower than the 95 octane required by most premium-fuel cars.
Does mixing fuel actually save money?
Short-term savings may be offset by reduced efficiency and potential costly repairs. It is generally not economically viable.
What should I do if I accidentally use regular fuel?
Avoid hard driving and reduce load. Refill with the correct fuel as soon as possible. The car may run less efficiently temporarily.
Are all cars affected the same way?
Modern cars with knock sensors may adapt temporarily, but performance drops and heat increases, reducing engine life. Older cars are more vulnerable to damage.
Sources
- Best Car Web (JP) — ガソリン代節約の落とし穴!? ハイオク仕様にレギュラーガソリンを半分混ぜても大丈夫なのか？
