Flex fuel is a type of fuel that is a blend of gasoline and ethanol, which is an alcohol made from agricultural crops like corn or sugar cane.Flex fuel can be used in specially-designed vehicles that are capable of running on different proportions of gasoline and ethanol. These vehicles have a flexible fuel sensor that detects the ratio of ethanol and gasoline in the fuel tank, and adjusts the engine's fuel injection andFlex fuel is a renewable fuel option that can help reduce greenhouse gas emissions and is considered an alternative to traditional gasoline. The amount of ethanol in the blend can vary, with most flex fuels containing up to 85% ethanol (E85) and the rest being gasoline. Vehicles that are designed to run on flex fuel are called flex fuel vehicles (FFVs) and can operate on a wide range of fuel mixtures, from pure gasoline to a blend of gasoline and ethanol. The use of flex fuel can help reduce dependence on petroleum-based fuels and promote the use of domestic, renewable resources. Some countries require a minimum amount of ethanol to be blended into gasoline as a way to reduce emissions and promote agricultural production. Overall, flex fuel is seen as a viable alternative to traditional gasoline, particularly in regions where renewable resources are abundant.