is there any way to check the octane rating of gas?

[hudson231]

test the specific gravity is with the beaker and mix water to get the alcohol to separate correct?

 

[36382mm]

test the specific gravity is with the beaker and mix water to get the alcohol to separate correct?

No not exactly its just the density versus water (the standard for liquids). Here is some good info http://www.racegas.com/article/26

 

[hudson231]

Ok thank you sir