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Cooling can alter density, viscosity and pressure, but full-cycle energy and reset cost remain finite.", "The fluid-only cold-service bound omits container, exchanger, pipes, insulation, boil-off, pump, frost and pressure-loss penalties. It is not a vehicle-ready cooling design.", "The 20 K cooling target is not a solved exchanger or a demonstrated speed/braking gain.", "The cold-source requirement is not included in the 25 kg vectoring allowance or the published P3.4 mass. No cooling-derived gain is credited to the current vehicle screen." ] }