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"I cant wait to see teenagers in the future siphoning ethanol from cars to get drunk on."

Ethanol producers are required by law to put poison in the ethanol so that it isn't fit for human consumption. In most cases it is also mixed with gasoline. In Brazil they do sell cars that will burn 100% ethanol, 100% gasoline, or any combination of the two (over 70% of all new cars sold in Brazil are like this and most are manufactured in the U.S.). Here though most cars sold to burn more than the 20% to 25% ethanol all new cars can handle are still not made to run on pure ethanol. They burn E85 (85% ethanol). E85 is sold with somewhat higher than 15% gasoline in the winter though to help with cold starting engines. I doubt many people would want to drink something that is 15% gasoline, pure ethanol with poison it, or even pure ethanol with no poison in it coming out of a gas tank.