Fuels: When the same stuff is a bit different...

The two fuel levels are theoretically interchangeable, and for high performance cars with especially high compression engines Avgas can be beneficial.

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What is the difference between super petrol used in cars and Avgas used in light aircraft?  How inter-changeable are they?  RKM

Both are basically “petrol” ...aka gasoline...enhanced by additives to achieve a higher than natural octane rating, which for most cars needs to be above 90 and for most light aircraft needs to be more than 100. 

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Note: The results are not exact but very close to the actual.