What is the vapor pressure of aviation gasoline compared to automotive gasoline?

Aviation gasoline typically has a lower vapor pressure compared to automotive gasoline. This is largely due to the different operational needs and specifications of the two types of fuel. Aviation gasoline needs to remain stable and function effectively under a wide range of altitude and temperature conditions, particularly at higher altitudes where pressure and temperatures are significantly lower.

A lower vapor pressure in aviation fuel helps prevent the fuel from vaporizing too easily, which could lead to vapor lock issues in the engine. On the other hand, automotive gasoline is designed to achieve efficient combustion in varying engine conditions and therefore has a higher vapor pressure to ensure better fuel atomization in the engine, especially in lower-temperature conditions.

Therefore, understanding the lower vapor pressure of aviation gasoline accentuates its suitability for aircraft operability and safety, differentiating it from automotive fuel which is formulated for a distinct operational environment.