Swift Fuels Advances Development of High-Octane Unleaded Aviation Fuel

Swift Fuels continues the advancement of its 100R unleaded aviation gasoline. On September 4, 2025, they announced the successful outcome of the voting results for their ASTM International Production Specification. The successful outcome of the vote and the subsequent publication of the ASTM Production specification are significant milestones in bringing a new transportation fuel to market.

Swift, in the announcement, states, “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.” It follows the September 2024 FAA issuance of Supplemental Type Certificates (STC) for the Cessna 172 R and S models and the Lycoming IO-360-L2A to Swift. The announcement goes on to say that, “As of today, 5 US flight schools utilize 100R as well as 5 flight schools in the EU (Germany, Belgium, Austria, and the Netherlands).” Swift has indicated that they are working with the FAA to expand the approval of 100R to additional engines and airframes.

Currently, Swift Fuels holds an STC for the use of UL94 aviation gasoline (94 octane) in aircraft requiring lower octane fuels. This fuel is currently produced and supplied by Swift Fuels in accordance with ASTM Production Specification (ASTM D7547).