Swift Fuels’ 100R Unleaded Avgas Gets ASTM Nod

(General Aviation News) Swift Fuels has received approval of an ASTM International production specification for its 100R unleaded avgas. -- The final voting results from ASTM were published Sept. 4, 2025, after several years of “dedicated research by the team from Swift Fuels working in collaboration with FAA and numerous OEMs from Lycoming, Continental Aerospace, Rotax, Textron Aviation, Piper, and others, plus testing laboratories and various aviation part suppliers,” said company officials.

The approval is for use in Cessna 172R and 172S models with Lycoming IO-360-L2A engines.

Swift Fuels will now work with the FAA to expand the Approved Model List (AML), which company officials say they expect to happen soon. That will allow 100R unleaded fuel to be used in more aircraft and engines in the GA fleet.

“We have completed hundreds of tests with FAA oversight and also with many third-party expert firms,” said Swift Fuels CEO Chris D’Acosta. “We then documented our results to industry and FAA over the past few years.”

This is the third time in 11 years that Swift Fuels has successfully navigated the ASTM process, company officials noted.

“As of today, five U.S. flight schools utilize 100R, as well as five flight schools in the EU (Germany, Belgium, Austria and The Netherlands),” company officials said, adding it “expects to rapidly expand the coverage of 100R at many more sites across the globe in the weeks and months ahead.”

“AOPA has long supported the development and deployment of safe, reliable unleaded fuels, and this achievement is a positive step in that direction,” said AOPA President and CEO Darren Pleasance.

“The approval of 100R for an ASTM International production specification represents another significant step in the transition to unleaded aviation fuel, while strengthening our industry’s commitment to safety,” echoed NATA President and CEO Curt Castagna.

AOPA and NATA are part of EAGLE (Eliminate Aviation Gasoline Lead Emissions), a government industry initiative with the mission to have general aviation lead free by 2030.

Excerpt from Swift Fuels: On September 4, 2025, ASTM International published the final voting results approving Swift Fuels’ 100R unleaded avgas for an ASTM International Production Specification. This is the culmination of several years of dedicated research by the team from Swift Fuels working in collaboration with FAA and numerous OEMs from Lycoming, Continental Aerospace, Rotax, Textron Aviation, Piper, and others, plus testing laboratories and various aviation part suppliers. Members of the ASTM voting committees represent several hundred companies from around the world including major international oil companies plus fuel experts and representatives from military and civilian entities. This is the third time in 11 years that Swift Fuels has successfully navigated the ASTM process to be awarded an ASTM Production Specification for unleaded aviation gasoline.

Swift Fuels will continue the transition to unleaded avgas by rolling-out new sites to utilize their 100R Unleaded Avgas. As of today, 5 US flight schools utilize 100R as well as 5 flights schools in the EU (Germany, Belgium, Austria and The Netherlands). The company expects to rapidly expand the coverage of 100R at many more sites across the globe in the weeks and months ahead.

Swift Fuels, LLC is the global leader in the advancement of premium Unleaded Avgas to eradicate toxic lead emissions from piston aircraft using 100LL over the last 7 decades. Swift Fuels is the only producer of unleaded avgas in the US market with both FAA-approved certifications for engines and airframes and ASTM International compliant fuel standards. Swift Fuels has sold over 4.5 million gallons of unleaded avgas in the past several years, which serves to reinforce the commercial readiness of our fuels with our market stakeholders. Many more locations globally will be joining this transition to Swift Fuels 100R Unleaded Avgas soon. READ MORE

“AOPA has long supported the development and deployment of safe, reliable unleaded fuels, and this achievement is a positive step in that direction,” said AOPA President and CEO Darren Pleasance.

Swift Fuels already supplies 100R to a small number of flight schools in the U.S. and Europe, but ASTM helps pave a simpler path forward for wider distribution following expanded FAA certification. READ MORE