Gasolina X Etanol is a free Android app developed by Hertz Soluções that helps users determine which fuel is more cost-effective to use when filling up their vehicles. The app is designed for users in Brazil, where it is common to choose between gasoline and ethanol as fuel options.

The app is straightforward to use. Users enter the current prices of gasoline and ethanol, and the app calculates which fuel is more cost-effective based on the fuel consumption of the vehicle. The Gasolina X Etanol app is an excellent tool for those looking to save money on fuel and make more informed decisions at the pump.