E10 unleaded fuel

From 1st September 2021, the Government has mandated that all regular unleaded petrol will increase ethanol content up to 10%. This change will result in reduced CO2 emissions. While the car industry is prepared for the change to ‘E10’, many powered aircraft that are fuelled by mogas have the potential to suffer long term damage to their components and fuel lines from the increased ethanol content.  Therefore unless otherwise directed by the aircraft type certificate holder, E10 is currently not recommended for use in aircraft that are permitted to use Mogas. UL91 and 97 Octane E5 Super Unleaded remain as alternatives to the obsolete E5 specification mogas.