Some of the corn goes into high fructose corn syrup (which is a key ingredient in our nations manufactured food industry). A good portion is used as feed for other food (all those signs promoting corn-fed beef are a symbol of this).
Here are the figures - "In 2000, over 90% of the U.S. corn crop went to feed people and livestock, many in undeveloped countries, with less than 5% used to produce ethanol. In 2013, however, 40% went to produce ethanol, 45% was used to feed livestock, and only 15% was used for food and beverage (AgMRC)."
The real problem with corn-based ethanol is that it takes more energy to create a gallon then the energy put out by the fuel, and the total full-production cycle GHG emissions are greater than when using petroleum products.
It's Final -- Corn Ethanol Is Of No Use
http://www.forbes.com/sites/jamesconca/2014/04/20/its-final-corn-ethanol-is-of-no-use/
"In 2014, the U.S. will use almost 5 billion bushels of corn to produce over 13 billion gallons of ethanol fuel. The grain required to fill a 25-gallon gas tank with ethanol can feed one person for a year, so the amount of corn used to make that 13 billion gallons of ethanol will not feed the almost 500 million people it was feeding in 2000. This is the entire population of the Western Hemisphere outside of the United States.
In 2007, the global price of corn doubled as a result of an explosion in ethanol production in the U.S. Because corn is the most common animal feed and has many other uses in the food industry, the price of milk, cheese, eggs, meat, corn-based sweeteners and cereals increased as well. World grain reserves dwindled to less than two months, the lowest level in over 30 years."
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