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mrtexas · 09-27-2020, 01:30 PM

You might not know it but the octane method for avgas is different so octane comparison is apples and oranges. However avgas is almost 100% iso-octane with butane added for vapor pressure.

09-27-2020, 01:30 PM	#14
mrtexas Senior Member Join Date: May 2010 Location: Sugar Land, TX Posts: 4,395	Re: aviation gas You might not know it but the octane method for avgas is different so octane comparison is apples and oranges. However avgas is almost 100% iso-octane with butane added for vapor pressure. __________________ 41 woodie https://41fordwoodie.weebly.com/