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So, one thing I noticed during the stream is that they talk about multiple "fueling" trips per crewed vehicle, but you would think that an unmanned fuel transporter would be able to fully fuel a manned vehicle of the same basic design in one trip. That, coupled with the fact that I find it hard to believe that Musk has forgotten to account for the water requirements of an Earth-Mars trip make me think that maybe there are some pretty significant engineering details that have been considered, but where glossed over for the sake of keeping the talk accessible.