Which property is NOT characteristic of aviation gasoline?

Aviation gasoline, commonly referred to as avgas, possesses specific characteristics tailored for optimal performance in aviation engines. One key property of aviation gasoline is its high heat value. This means it releases a significant amount of energy per unit of fuel when combusted. The high heat value is crucial for aircraft engines, as it contributes to sufficient power output and efficient operation during flight.

In aviation applications, fuels typically need to exhibit high volatility to ensure proper vaporization and combustion at the varied altitudes and temperatures encountered in flight. High volatility helps in starting the engine and allows for efficient operation at lower temperatures.

Vapor pressure is also an important consideration in aviation fuels, and aviation gasoline is designed to have low vapor pressure. This attribute helps in preventing vapor lock and ensuring that fuel remains in a liquid state under a variety of temperature and pressure conditions during flight.

Given these characteristics, identifying low heat value as a non-characteristic trait of aviation gasoline aligns with the understanding that avgas is specifically formulated to deliver high performance and energy efficiency, which low heat value would contradict.