Chart #31 indicates that the use of induced torpor would result in a savings of 70% in total consumables mass (total food mass, really). However, on slide #22, the savings offered by torpor in terms of nutrition mass/crew/day is no more than 59% (more likely 27-42%). What am I missing here?

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The bar chart on slide #22 shows dosage rates for TPN-based nutrition only. For a fully-active person, this is about 0.7 kg/day of the aqueous dextrose/amino acid/lipid solution. By comparison, the typical mass allocation with traditional solid/partially-hydrated food used by astronauts, based on spaceflight experience and the ISS, is over 2 kg/day.

For our baseline habitat, we used the “resting-level” TPN dosage rate (0.55 kg/day) to determine our food stores. This is a conservative approach since we did not take any further reductions for the Torpor-state. This handles our contingency case if the crew were to awake and remain in a conscious state.

So, we don’t think you are missing anything here, just using the wrong basis number for comparison!