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In the new era of electric propulsion, where propellant tanks are larger and missions are longer, the accuracy of classic mass retrieval methods has become obsolete. The knowledge of the exact amount of remaining propellant is critical for optimising a spacecraft’s lifespan. A team from Luleå University of Technology has developed the “Improved Pressure-Volume-Temperature Gauging” Method. This method uses existing technology readiness levels (TRL 9) sensing technologies and it improves the physical modelling of the available propellant as well as the accuracy of the classic Pressure-Volume-Temperature (PVT) retrieval techniques. Thanks to smart use of the spacecraft’s telemetry, its implementation will help spacecraft propulsion systems providers, spacecraft operators, telecommunication companies, and space agencies to increase the lifespan of space missions.