As general aviation transitions to a lead-free future, some GA pilots are wondering about 115/145 avgas.
unleaded avgas
Swift Fuels’ 100R unleaded avgas gets ASTM nod
The approval is for use in Cessna 172R and 172S models with Lycoming IO-360-L2A engines.
A warning from the past for unleaded avgas
Oil refineries add 0.5 grams of Tetraethyllead (TEL) per gallon to 80/87 fuel. But why?
Everyone beware
A question that every pilot and general aviation aircraft owner should be asking is “What do I need to do to my aircraft before the transition to unleaded avgas and 100LL is gone forever?”
Court claims GA still doesn’t have a commercially available unleaded avgas
Judge S. Raj Chatterjee noted in the May 30, 2025, ruling that since G100UL has not gone through the ASTM process for specification, it cannot be considered “commercially available.” But the folks behind the unleaded fuel have something to say about that.
FAA moves to ensure 100LL availability
Ensuring the availability of 100LL at general aviation airports is in the process of being added to the grant assurances required by the FAA’s Airport Improvement Program (AIP).
The past and future of avgas
Today’s search for an unleaded avgas is so different from similar searches in the past, which was a very large cooperative effort to find an answer — and they were looking for one fuel that could be produced by any oil company.
FAA orders California county to reverse 100LL ban
In its ruling on March 24, 2025, the director of the FAA Office of Airports Compliance and Management Analysis ordered the county take three corrective actions.
Alaska’s avgas anxiety
“Without a dependable source of avgas, many Alaskans would lose their only access to numerous critical services, including medical care, groceries, and mail.”