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If you see this label, or a similar one, attached to the pump that's dispensing your Pontiac's fuel, you're feeding it an ethanol-blend. Disclosure isn't required in some states, however. If yours isn't one that does, you can determine the presence of ethanol with a simple test. Take a graduated cylinder and fill it with a measured amount of water. Mix the subject fuel in with it, agitate the two profusely, and allow the mixture to settle. Since alcohol attracts water, if ethanol is present, it will mix with it. If you find more water in your cylinder than you started with, your fuel of choice is blended with ethanol.