IF YOU DON'T NEED 100 OCTANE LEADED
GASOLINE FOR YOUR AIRPLANE,
WHY ARE YOU USING IT?
More than 80% of General Aviation aircraft, including 99+% of Light Sport Aircraft (LSA) could be flying on premium unleaded fuel.
Unleaded aviation fuel is sometimes referred to as MOGAS (motor gasoline) or autogas by pilots, though these terms are not technically interchangeable. MOGAS is an aviation fuel — automotive gasoline specifically tested and approved for aviation use per FAA Advisory Circular AC 91-33, meeting ASTM D4814 specifications, and free of ethanol — but is rarely available at airports today. Autogas generally refers to automotive gasoline obtained from a filling station pump, and many pilots use the two terms interchangeably even though not all autogas qualifies as MOGAS. Many light aircraft, including those with Rotax engines or an Autogas STC (Supplemental Type Certificate), can legally use non-ethanol unleaded gasoline meeting the appropriate octane and specification requirements as an alternative to 100LL. This site lists airports across the United States that offer unleaded fuel for aircraft use.