Should the Honda Avancier use 92 or 95 octane gasoline?

[DelAustin]

According to the official vehicle user manual, the Honda Avancier is recommended to use 92 octane gasoline. In addition to checking the suitable gasoline grade in the vehicle user manual, you can also find this information on the fuel tank cap, which will be clearly marked. Generally, the appropriate gasoline grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. However, with the application of new technologies, the compression ratio alone cannot determine the required gasoline grade. Even engines with high compression ratios can be tuned to use lower octane gasoline. This is because other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, the higher the gasoline octane number, the higher the octane value and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If the Avancier occasionally uses the wrong gasoline grade, simply switch back to the correct grade after the current tank is used up. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles recommended to use lower octane gasoline, using higher octane gasoline will not cause damage, but the increased octane value can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles recommended to use higher octane gasoline, using lower octane gasoline can cause engine knocking. Due to the significantly lower octane value, the gasoline's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance will develop during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine conditions. The vibrations not only affect driving stability but also cause abnormal wear on the piston and cylinder, potentially leading to cylinder scoring in severe cases.

[StKaden]

I've been driving the Crown for over two years and always use 92-octane gasoline. The Honda manual clearly states that 92-octane is sufficient, and 95-octane isn't necessary. The engine was designed with 92-octane's characteristics in mind—it has a moderate compression ratio, making 92-octane perfectly adequate for daily driving. Performance remains strong, with fuel consumption stable at around 9 liters per 100 km. While 95-octane might offer slightly quicker throttle response and smoother idling, 92-octane is more economical, saving dozens of yuan per tank and adding up significantly over time. The key is to avoid low-quality or high-ethanol gasoline, which can cause carbon buildup and harm performance. For occasional highway trips where you want a bit more refinement, 95-octane is a nice treat, but for commuting, 92-octane is plenty—easier on the wallet and better for the environment too.

[Micah]

From a fuel consumption perspective, I chose 92-octane gasoline. The Avancier has a large fuel tank, and filling it with 95-octane is more expensive, while 92-octane is more economical. The manual states that 92-octane is sufficient, as the engine can adapt and provides adequate power for city driving. In practice, the fuel consumption is similar to that of 95-octane, with a difference of less than 0.5 liters per 100 kilometers. Why spend more to save money? While 95-octane has better cleaning properties, 92-octane also allows the car to run well. The key is to use fuel from reputable gas stations to avoid engine damage from low-quality fuel. Using 92-octane long-term saves money and provides peace of mind, unless you're pursuing peak performance.

[LawsonMarie]

For a better driving experience, I prefer using 95-octane gasoline. The Honda Avancier has strong horsepower, and the higher octane rating of 95 ensures more complete combustion, resulting in smoother acceleration from start. While 92-octane is usable, 95-octane makes the engine more responsive, eliminating any sense of power depletion during high-speed overtaking. The manual allows for 92-octane, but 95-octane noticeably enhances performance. It also slightly reduces fuel consumption and provides greater peace of mind.