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WFO
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To determine how much alcohol has been added by the oil company, you can do the following simple test. Be sure to use adequate ventilation, avoid sparks, heat and any other sources of ignition for liquid gasoline/alcohol AND their vapors!

This is known as "Water Extraction".
A graduated glass cylinder, usually 100 milliliters (ml), is used for this test. Put 100ml of the gasoline to be tested into the graduated flask.

Add 10ml of water to the flask containing the 100ml of sample gasoline.

Seal the top w/a stopper and thoroughly agitate the sample. Let this rest for a couple minutes.

If there's no alcohol in the sample, there will still be only 10ml of water that has separated into a layer at the bottom of the container.

If there IS alcohol present in the sample, the amount of water at the bottom of the container will have increased by the amount of alcohol that's present in the 100ml sample.

Subtracting the original 10ml of water that was added at the start of the test from what is now there is the percentage of alky that has been added to the gasoline.
 
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