What is the Difference Between Aviation Gasoline and Regular Gasoline?

[Tina]

Aviation gasoline and regular gasoline differ in the following aspects: 1. Different characteristics: Aviation kerosene has excellent combustion performance, complete combustion, and good low-temperature fluidity. Gasoline's important characteristics include volatility, anti-knock properties, stability, safety, and corrosiveness. 2. Different uses: Aviation kerosene is used for supersonic aircraft, requiring low saturated vapor pressure and good thermal stability. Gasoline is one of the most widely used light petroleum products and serves as an important fuel for engines. 3. Different physicochemical properties: Aviation fuel has over 20 physicochemical indicators, such as total acid number, density, sulfur content, flash point, freezing point, kinematic viscosity, corrosiveness, water reaction, and actual gum content. Automotive fuel has only over 10 indicators, with the former being more comprehensive and stringent in physicochemical property control than the latter.

[CamillaFitz]

As a mechanic with 20 years of experience, I can speak with authority on fuel differences. Aviation gasoline like 100LL is specifically designed for small aircraft, with lead additives to boost octane ratings above 100, preventing engine knocking or detonation under high-altitude low-pressure conditions. Regular automotive gasoline is now mostly unleaded, with octane ratings around 90 sufficient for low-altitude operation. Aircraft fuel is more stable and less volatile because of the significant temperature and pressure changes in flight—ordinary fuel would vaporize and fail at high altitudes, causing accidents. Aircraft maintenance often involves checking for fuel leaks, and protective gloves are necessary due to the toxicity of lead, whereas car engines are less sensitive. The price difference is substantial: aviation fuel costs several times more per liter and is supplied exclusively at airports, while regular gasoline is widely available. Remember, never put automotive fuel in an aircraft—it will immediately damage the engine. Conversely, using aviation fuel in a car might work but will corrode components. Safety comes first, so understanding these details is crucial.

[SanGrant]

Having flown small aircraft for many years, I deeply understand the vital role of aviation gasoline. Its octane rating of 100+ ensures stable combustion in thin air, preventing engine fires caused by detonation; whereas regular gasoline with lower octane is suitable for cars but poses dangers at high altitudes. Although lead additives provide lubrication, they are highly toxic, requiring gloves and masks during refueling to prevent poisoning. I've observed that aviation fuel is more resistant to evaporation and doesn't freeze in low temperatures; car fuel may fail to ignite or suddenly stall at high altitudes. From a safety perspective, checking fuel purity before flight is essential—any impurities can be catastrophic; for regular driving, 92-octane fuel suffices. Aviation fuel standards are strictly regulated by the FAA, and fuel leaks can cause significant hazards. Flying is a high-risk activity where fuel quality can mean the difference between life and death—there's no room for carelessness.

[MacFrank]

I've driven cars and also piloted a Cessna aircraft, and the refueling experiences are worlds apart. With cars, regular gasoline costs just tens of yuan per liter and can be filled up anywhere, while aviation gasoline is double the price and requires trips to specialized airport fueling points. Due to low air pressure at altitude, aviation fuel has ultra-high octane ratings and contains lead to prevent engine knocking, whereas regular fuel's lower octane could cause engine failure. Aircraft fuel demands extreme stability to prevent freezing or vaporizing at high altitudes; automotive fuel is less refined. During maintenance, I learned that using the wrong fuel would instantly ground an aircraft, while a car might limp along but suffer engine damage. My daily SUV runs fine on 92-octane fuel—convenient and safe; aviation hobbies demand premium-priced specialized fuels. However, recent years have seen trial introductions of unleaded aviation fuel, pricier but more eco-friendly, potentially becoming the norm in the future.

[McCharles]

I have been researching fuel differences for years with a focus on environmental issues. Aviation gasoline like 100LL still contains lead additives to boost octane and lubrication, but lead pollutes air and soil, posing health hazards; regular automotive gasoline is now lead-free, relying on alternatives like ethanol for a greener solution. The key difference lies in application: aircraft require high-octane fuel for stable high-altitude operation to prevent knocking, but lead emissions affect pilots and surrounding communities; regular vehicles use lower-octane fuel at low altitudes without such concerns. Recent developments in unleaded aviation fuel are underway but not yet widespread, with safety concerns keeping lead in use. From an environmental perspective, aviation fuel urgently needs reform to reduce toxicity while balancing reliability and sustainability. While new automotive fuel formulations effectively cut emissions, progress in aviation lags, requiring policy-driven improvements.

[OMakayla]

I am passionate about studying the evolution of gasoline in history. In the early days, gasoline during World War II contained lead to enhance performance, but environmental laws in the 1970s banned the use of lead in automotive fuel, leading to the transition of regular gasoline to unleaded formulations relying on additives. Aviation gasoline, such as Avgas 100LL, retained the old formula because small aircraft engines require high-octane fuel to adapt to high-altitude conditions. The differences are significant: aviation fuel has an octane rating of 100+ for stability and anti-knock performance, while automotive fuel typically has around 90, which is sufficient but evolves quickly with innovation. Old manuals always emphasized the importance of using aviation-specific fuel, prioritizing safety above all else. Nowadays, unleaded aviation fuel exists but is slow to gain traction. From a collector's perspective, the evolution of fuel reflects the fusion of technology and safety—regular gasoline has become a model of environmental friendliness, while aviation fuel conservatively upholds traditional reliability.