UNLEADED FUEL / What we've learned AOPA fuel demo Baron at 200 hours BY AOPA STAFF THE AOPA UNLEADED fuel demonstration Beechcraft Baron's year of flying with two different fuels has come to a close-and we've learned a great deal. AOPA began flying the 1966 Beech C55 in fall of 2023 to demonstrate the efficacy and safety of unleaded fuel in support of a transition to unleaded avgas. It has logged about 200 flight hours using unleaded fuel in the left engine and avgas in the right-and the newly overhauled Continental IO-520s are performing flawlessly. Regular oil analysis, compression checks, and borescope inspections AOPA PILOT / November 2024 83