What type of fuel is primarily used for jet engines?

Jet Propellant 8 (JP-8) is primarily used for jet engines based on its formulation as a kerosene-based fuel that meets the specific requirements for aviation. It is designed for high performance in military aircraft and is compatible with all jet engines. JP-8 provides a wide range of operational benefits, including a higher flash point and better thermal stability than some alternative fuels, which makes it well-suited for the demanding environments encountered during flight. Furthermore, it can be used as a fuel not only for jet engines but also for ground vehicles, making it versatile within military logistics.

In comparison, Diesel Exhaust Fluid (DEF) is used in diesel engines to reduce emissions but is not a fuel itself. Regular unleaded gasoline and Premium jet fuel (Jet A) are designed primarily for cars and civilian aircraft, respectively, and do not possess the same performance or safety characteristics as JP-8 for military aviation use. Hence, JP-8's composition and properties make it the preferred fuel for military aviation.