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In page Food vs. fuel:
"Some argue that the US government's policy of encouraging ethanol from corn is the main cause of food price increases.[1][2][3][4][5][6] US federal government ethanol subsidies total $7 billion per year, or $1.90 per gallon. Ethanol provides only 55% as much energy as gasoline per gallon, realizing about a $3.45 per gallon gasoline trade off.[7] Corn is used to feed chickens, cows, and pigs, so higher corn prices lead to higher prices for chicken, beef, pork, milk, cheese, etc.[citation needed]
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