STAG GAS COMPUTER is revelatory tool allowing to manage fuel consumption in cars equipped with newest STAG LPG system. Together with GPS enabled in mobile phone, driver is able to watch fuel consumption (momentary and average), measure fuel already spent and then calculate related costs. STAG GAS COMPUTER is also LPG system parameters and malfunction view. It gives access to on-board diagnostic features (OBD-II/EOBD). Application supports only Q-generation STAG controllers including STAG-4 QB