Aviation Consumer’s Rick Durden logged 3.3 hours on AOPA’s Beech C55 Baron burning G100UL on one engine and 100LL on the other. Other than slightly better performance from the engine on unleaded, it was a non-event. Durden and Aviation Consumer Editor-in-Chief Larry Anglisano debriefed the flight.

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.


  1. Rick and Larry. Great video and very informative. Less fuel, cleaner running….what’s not to like?

    Why did UND bail out of the UL program last year? Why haven’t we heard more about the UND findings? Why haven’t we heard from Lycoming and the FAA about the UND situation?

    Thanks again for a great video.

    • I think you heard more about the University of North Dakota findings today. In another AVweb Flash article today (21 Feb 2024), “Mike Busch To Probe Unleaded Fuel Valve Issues”, you get Mike Busch’s commentary on the UND reports.

      Also, just to be clear, the fuel UND was using was apparently Swift 94UL, a different fuel than the G100UL discussed in the Rick Durden video above. There is more than one unleaded fuel. They behave differently from one another in some cases.

  2. “Other than slightly better performance from the engine on unleaded, it was a non-event.”

    How did this manifest itself to the pilot? More thrust out of one engine than the other at take off power? Less fuel burn from one engine than the other? Or?