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.
GAMI
Notes from SUN ‘n FUN 2025
Attending SUN ‘n FUN for the first time since 2019, Publisher Ben Sclair filled his reporter’s notebooks with news from the show.
FAA seeks information on issues related to unleaded fuel
Released March 28, 2025, the SAIB notes that the FAA has not identified an unsafe condition that would warrant an airworthiness directive. The bulletin also notes that it is for “information only.”
Efforts to stop 100LL sales in California thwarted
A judge has issued a tentative ruling denying efforts by the Center for Environmental Health to enforce a decade-old deal with California FBOs to stop selling 100LL when an “commercially available” unleaded avgas was on the market.
GA advocate raises alarm about California unleaded avgas court motion
The court action is “premature and counterproductive,” and could “cause undue harm to the general aviation community,” according to officials with the General Aviation Manufacturers Association (GAMA).
GAMI tests show G100UL does not damage paint
In the video, George Braly, a company co-founder and the person in charge of engineering, says the company conducted a 10-day simulation of a slow leak of the fuel “and no paint damage resulted.”
Unleaded avgas now available at KRHV
G100UL high octane unleaded avgas is now available for sale at Reid-Hillview Airport (KRHV) near San Jose, California.
One question, many answers
Asking technical experts the same question about exhaust valve recession problems with unleaded fuel and you’ll get a variety of answers — and each person is convinced they are right.
Murphy’s Law and the search for an unleaded fuel for general aviation
Murphy’s Law states that anything that can go wrong will go wrong. In the transition to unleaded fuel for general aviation, what could possibly go wrong?