What Octane Gasoline Should the Avancier Use?

[LeilaniLee]

The Avancier requires a minimum of 92 octane gasoline for all its models, as recommended in the vehicle's official owner's manual. In addition to checking the owner's manual for the appropriate gasoline octane, you can also find this information on the fuel filler door. Generally, the gasoline octane can also be determined by the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92 octane, those between 10.0-11.5 should use 95 octane, and those with higher compression ratios should use 98 octane. However, with advancements in technology, the compression ratio alone is no longer the sole determinant of gasoline octane. High compression ratio engines can now be tuned to use lower octane gasoline due to factors like ignition timing, turbocharging technology, and Atkinson cycle technology. Typically, higher octane gasoline has a higher octane rating and better anti-knock properties. For example, 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. If you accidentally use the wrong octane gasoline in the Avancier, simply switch back to the correct octane after the tank is empty. However, prolonged use of the wrong octane can have the following effects: Using higher octane gasoline in a vehicle designed for lower octane won't cause damage, but the increased octane rating can alter the fuel's ignition point, leading to delayed combustion. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. Using lower octane gasoline in a vehicle designed for higher octane can cause engine knocking. The significantly lower octane rating lowers the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without noticeable engine damage, but severe knocking indicates serious engine issues, affecting not only driving stability but also causing abnormal wear on pistons and cylinders, potentially leading to cylinder scoring.