Info from GAMI’s John-Paul Townsend about the new G100UL (unleaded avgas) in response to my inquiry: Scott, Thank you. Good question! I don't think we have any data on that. However,. given it's composition, I would not suspect any incompatibility. Thanks, John-Paul Townsend General Aviation Modifications, Inc. On Sep 3, 2022 6:57 PM, Scott Evans wrote: Congratulations on FAA Certification of this amazing product! I am taking possession of an ultralight with a Hirth F23 Fuel Injected 50HP 2-cycle engine. Do you have any data on running G100UL with 2-cycle oils mixed in 2-cycle engines such as the Hirth F23? Current literature states to use a 50:1 ratio of a high quality non-synthetic 2-cycle oil or 80:1 ratio of BlueMax 2-cycle oil if that helps any. Thanks again for all your work. Scott Evans, Sport Pilot