Zippo lighters primarily use a type of kerosene-based fuel known as lighter fluid. This fluid is specifically designed for use in portable lighters and matches, providing a consistent flame for lighting. The fuel is stored in a reservoir within the lighter and is released through a small nozzle when the lighter is activated. The choice of kerosene-based fuel is due to its ability to produce a hot, long-lasting flame that is ideal for outdoor use.

The use of kerosene-based lighter fluid is widespread because it is readily available, affordable, and effective for igniting a flame. According to a report by the National Fire Protection Association (NFPA), kerosene-based fuels are the most common type of fuel used in portable lighters, accounting for approximately 80% of all lighter fuel sales. This popularity is attributed to the fuel's ability to produce a flame that is both hot and long-lasting, which is crucial for various applications such as camping, cooking, and emergency lighting.

The specific type of kerosene used in Zippo lighters is often referred to as "Zippo lighter fluid," which is a proprietary blend of kerosene and other chemicals. This blend is designed to enhance the performance of the lighter, ensuring a reliable flame that can withstand wind and other environmental factors. The use of a proprietary blend also helps to prevent corrosion and maintain the longevity of the lighter's internal components.

In addition to its practicality, kerosene-based lighter fluid is also favored for its safety profile. When used as directed, it is relatively safe and poses minimal risk of fire or explosion. However, it is important to follow proper storage and handling procedures to prevent accidents. The NFPA provides guidelines for the safe storage and use of kerosene-based fuels, emphasizing the importance of keeping the fuel away from heat sources and open flames.

In summary, Zippo lighters use a kerosene-based fuel known as lighter fluid, which is a proprietary blend designed for optimal performance and safety. The widespread use of this fuel is due to its effectiveness, availability, and safety profile, making it a popular choice for a variety of applications.