Aviation Gasoline

Aviation gasoline (avgas) is the aviation fuel most commonly used in piston-engine aircraft within the general aviation community. Avgas remains the only transportation fuel in the United States to contain lead. More than 222,600 registered piston-engine aircraft can operate on leaded avgas. The most common and reliable type of avgas is 100 octane Low Lead, also known as 100LL. This leaded fuel contains tetra-ethyl-lead (TEL), which is an additive used to prevent engine damage at higher power settings. Although the FAA does not have direct regulatory responsibility for aviation fuels, it provides the initial certification approval of the aircraft with the fuel it operates on, and it oversees aircraft operators to ensure use of the correct fuel.

Getting the Lead Out

The FAA is working with critical government and industry partners to develop a multi-layered strategy to reduce and ultimately eliminate lead and its potential harmful effects from fuel for piston-engine aircraft based on various recommendations in the National Academies of Sciences, Engineering, and Medicine (NASEM) report. This strategy includes continued FAA collaboration with industry through the Piston Aviation Fuels Initiative (PAFI).

The FAA also continues to support other fuel applicants who have decided to pursue engine and airframe approvals that would allow the use of their fuel formulations via traditional certification processes, through the supplemental type certificate (STC) process, as spelled out in Section 565(c) of the FAA Reauthorization Act of 2018.

Path to a Lead-Free Aviation System – the EAGLE Initiative

On February 23, 2022, the FAA joined aviation and petroleum industry stakeholders to announce a comprehensive public-private partnership to transition to lead-free aviation fuels for piston-engine aircraft by the end of 2030. This initiative to Eliminate Aviation Gasoline Lead Emissions (EAGLE) will expand and accelerate government and industry actions and investments as well as establish the necessary policies and activities to permit both new and existing general aviation aircraft to operate lead-free, without compromising aviation safety and the economic and broader public benefits of general aviation.

The EAGLE Initiative is based on four pillars of action (depicted in the graphic above) designed to foster the necessary regulatory, innovation, and infrastructure solution sets to enable the commercial viability needed to facilitate the transition. For program definitions and answers to the most frequently asked questions about the EAGLE initiative, see Unleaded Fuel Development FAQs and Definitions (March 2022).

On March 16-17, 2022, the inaugural EAGLE meeting was held in Washington, D.C.  This two-day EAGLE meeting was an industry-sponsored event that convened more than 120 U.S. and international stakeholders. EAGLE participants discussed:

  • Organizational framework
  • Details of each pillar
  • Activities and associated timelines
  • Commitments of time, resources, and expertise to support the four pillars
  • Individual feedback on potential outcomes and actions for each pillar 

Additional EAGLE stakeholder meetings and presentations will be held three times annually. Documents from these gatherings are available here:

Meeting Materials and Participant Information from EAGLE Stakeholder Meeting, March 2023

Meeting Materials and Participant Information from EAGLE Stakeholder Meeting, November 2022

Presentation from Oshkosh AirVenture - July 2022

    Meeting Materials and Participant Information from EAGLE Stakeholder Meeting, June 2022

    Meeting Materials and Participant Information from Inaugural EAGLE Meeting, March 2022

    Piston Engine Aviation Fuels Initiative (PAFI)

    FAA & EPA Collaboration

    The FAA is also in close collaboration with the Environmental Protection Agency (EPA) on lead emissions associated with avgas.

    Media Inquiries: Contact the FAA Press Office at pressoffice@faa.gov

    Contact the FAA’s Alternative Fuels Team 

    Avgas Information and Resources


    Legislation and Policy

    Advisory Information

    Last updated: Tuesday, September 05, 2023