China could import up to 20 million tonnes of corn a year, more than six times the current level, to meet a switch to greater use of ethanol in fuel. Beijing plans to roll out a gasoline known as E10- containing 10% ethanol across the world’s largest car market by 2020. As much as 15 million tonnes of ethanol would be needed when the policy is implemented, or about 45 million tonnes of corn, the major raw material in its production.