Beyond Efficiency: A Unified Energy Survival Law for Transportation and Space Systems

Classical energy efficiency metrics systematically overestimate real-world performance because they model energy conversion as a single-stage process and implicitly neglect irreversible thermodynamic degradation. Across biological metabolism, electric transportation, information systems, and spaceflight, observed system-level outputs consistently fall far below what component-level efficiencies would predict. These discrepancies are most evident in advanced electric vehicles and reusable launch systems, where increases in battery capacity, power, or thrust do not yield proportional gains in driving range or payload mass. This paper introduces a Unified Energy Survival–Conversion Law that reformulates useful…