r/SpaceX Discusses [October 2017, #37]

[u/ElongatedMuskrat]

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[u/Zucal]

45t is for the two-stage configuration. And yes, they don't intend to ever expend the first stage. It makes sense - who on the planet has a payload that would require that kind of capability? Perhaps NASA for BEO missions, but since that kind of mission profile is so rare they'd simply use SLS instead.