What are the three main performance indicators of gasoline?

[OJosiah]

Here is a detailed introduction to the performance indicators of gasoline: 1. Volatility: Refers to the ease with which gasoline evaporates in the carburetor. It has a significant impact on engine starting, warm-up, acceleration, vapor lock, and fuel consumption. The volatility of gasoline is evaluated comprehensively by three indicators: distillation range, vapor pressure, and vapor-liquid ratio. 2. Anti-knock quality: Refers to the ability of gasoline to resist knocking combustion under various operating conditions. The anti-knock quality of automotive gasoline is expressed by the octane number. The higher the octane number, the better the anti-knock quality. The anti-knock capability of gasoline is related to its chemical composition. 3. Stability: Refers to the stability of gasoline when stored under natural conditions for a long time. It is characterized by gum content, induction period, and iodine value. The lower the gum content, the better; the longer the induction period, the better. According to national standards, the actual gum content per 100 milliliters of gasoline must not exceed 5 milligrams. The iodine value indicates the content of olefins.

[CatherineDella]

Gasoline has three primary performance indicators: anti-knock quality, volatility, and chemical stability. Anti-knock quality refers to the octane rating. Having driven multiple car models, I can confirm that higher octane prevents engine knocking—those disturbing rattling sounds that damage internal engine components, especially during acceleration. Volatility affects cold-start performance. I once used low-volatility gasoline in winter, and the engine took forever to start, increasing fuel consumption and wear. Chemical stability ensures gasoline doesn't oxidize and degrade, forming gum deposits that clog fuel lines. I've witnessed old gasoline causing injector blockages after prolonged storage. Always check your owner's manual for recommended fuel grades—don't compromise engine lifespan and fuel efficiency by using substandard fuel to save money. Additionally, eco-friendly gasoline with reduced sulfur content is a wise choice.

[DelRylee]

The key performance indicators of gasoline include anti-knock properties, volatility, and chemical stability. In my daily driving, I often pay attention to whether the octane rating is sufficient to prevent noise and vibrations caused by knocking, which is crucial for engine protection. Volatility determines whether gasoline vaporizes smoothly at low temperatures, especially during cold winter mornings when starting the car—poor volatility may require repeated ignition attempts. Chemical stability prevents gasoline from aging and accumulating impurities, avoiding clogs in the fuel pump or injectors. I also focus on gasoline's combustion efficiency; higher octane ratings generally result in fewer exhaust emissions, but cost and performance must be balanced. Standard unleaded gasoline is quite suitable for most family cars. During maintenance, checking the cleanliness of the fuel system is also essential.

[ArianaDella]

Three key indicators of gasoline: anti-knock performance, volatility, and chemical stability. From a repair perspective, low anti-knock performance (octane rating) can easily cause knocking, which sounds like the engine is hammering and can damage pistons. Poor volatility makes the engine hard to start, especially in cold weather when the air-fuel mixture formation is not ideal. Insufficient chemical stability can lead to gasoline oxidation and gum formation, clogging the system and affecting injection precision. It's recommended to check the fuel grade label before each refueling; octane rating is crucial for high-performance engines, while regular cars can use 92-octane fuel without exceeding it. Regularly clean the fuel system to prevent clogging.