Caro Flex (beta)

This app help you to decide refuel a flex car with ethanol or gasoline in Brazil. Here in Brazil we have the so-called Flex car that accept ethanol or gasoline as fuel. To decide refuel on ethanol or gasoline, we make a simple math: if the price of ethanol is less than 70% of the price of gasoline refuel with ethanol, otherwise refuel with gasoline.