How does the only approved (so far) unleaded 100 octane aviation fuel perform in the real world? Just fine as you might expect. You can also read the written report here.

Larry Anglisano
Larry Anglisano is a regular AVweb contributor and the Editor in Chief of sister publication Aviation Consumer magazine. He's an active land, sea and glider pilot, and has over 30 years experience as an avionics tech.


      • Two flights do not ameaningful report make. Perhaps a report after 300 hours would be a bit more useful. To really make a 300 hr post flight mean something open up the engine and report on anamolies, if any.

        • Embry-Riddle did a 150-hour test:

          “Further, at GAMI’s request, ERAU, as a 3rd party, completed a highly successful 150 hour engine durability test conducted on an engine that already had 1400+ hours of operation on 100LL. The post-test engine teardown demonstrated the engine and combustion chambers were noticeably cleaner at the end of that 150 hours operating on G100UL avgas than before the test started. That testing at ERAU was closely monitored by the FAA with personnel out of the Atlanta Aircraft Certification Office.”

  1. I hope this stuff gets distributed soon. I prefer using Mogas but there are so few airports that carry it. My rotax will take low lead, but then I cut my oil changes in half. Keep the let out.

  2. According to J. Fisk’s experimentation in his RV-14 he stated the following conclusion with GAMI fuel for hos LYC 215 hp engine:
    “At best, I can say that the slightly higher energy content and slower burn rate of G100UL produced about a 10- to 15-degree increase in exhaust gas temperatures (1430 degrees F to 1445 degrees F or a 1 percent change). Operationally, that difference is insignificant and equivalent to the slightest possible tweak in fuel mixture settings.”

  3. Interesting to note the slight increase in exhaust gas temperature. I had read an article about UL94 compared to 100LL and they also noted a slight increase in exhaust gas temperature when using the UL94. I could imagine that using either of these new unleaded fuels might result in possible valve recession or increased exhaust system ware over time, due to the additional heat occurring at this point in the combustion cycle.