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Is Higher Octane Gasoline Always Better?

2 Answers

DiKevin

07/29/25 1:54am

Higher octane gasoline is not necessarily better. The octane rating of gasoline is not related to the purity or quality of the fuel. The octane rating indicates the gasoline's resistance to knocking, meaning that higher octane gasoline burns more slowly and is less prone to premature ignition, making it more suitable for engines with higher compression ratios. Conversely, engines with lower compression ratios require lower octane fuel. When choosing gasoline, drivers should not simply opt for the highest octane available but should instead follow the recommended octane rating specified in their vehicle's manual and consider the engine's compression ratio. For example, if a car designed to use 92-octane gasoline is filled with 95-octane fuel, the higher anti-knock properties of the 95-octane fuel will not be fully utilized. This can lead to "delayed combustion," where the fuel does not reach its auto-ignition point by the time the engine compresses it, resulting in incomplete combustion, increased pollution, and fuel wastage.

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ZaneLee

08/12/25 5:57am

I've driven quite a few cars and found the idea that higher octane fuel is better to be very misleading. My old Passat's owner's manual recommends using 95 octane. Once I tried filling up with 98 octane, and there wasn't much improvement in power or fuel efficiency, just an extra few dozen yuan spent on gas. Higher octane fuel mainly offers better anti-knock performance, but it's completely unnecessary when the engine's compression ratio isn't high. Using fuel with too high an octane rating can also lead to incomplete combustion, increasing exhaust pollution, which isn't good for the environment. With gas prices soaring now, I just stick to 95 octane—it saves money and gives peace of mind. The key is to check your own car's manual; matching is what matters. Don't blindly listen to others pushing higher octane fuel, or you'll just be throwing money away.

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