This application provides a suggestion if it is worth fueling your flex fuel vehicle with gasoline or ethanol (alcohol). This suggestion is provided from the price of gasoline and alcohol, informed by the user.You can use the simple method, which considers it better to fill your flex-fuel car with ethanol if the price of a liter of this fuel is at least 70% lower than the price of a liter of gasoline.You can also use the custom method, in which you inform the specific consumption of your flex-fuel car with both fuels.The application does not share any type of information, does not have ads, does not need to register, is light and easy to use.