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What is meaning of flex fuel?

A type of fuel that contains both petroleum gasoline and ethanol. In the United States, flex fuel is typically a mix of 85% gasoline and 15% ethanol. Ethanol is a renewable fuel that can be produced from corn, sugarcane, and other plants. Flex fuel vehicles are designed to run on any combination of gasoline and ethanol, and they automatically adjust their engine performance based on the fuel that is being used.