If the booster attempts either land or sea landing, how much fuel (RP-1 and LOX) is left in its tanks right after stage separation?

Recently, I have heard numbers as high as 30% of its total tank capacity, but that seems unnecessarily much to me. Appreciate sources.

  • $\begingroup$ You "THE" Everyday Astro? Anyway depends if they do a boost back burn (three burns) to RTLS or a downrange landing (two burns). But 30% was the number Musk quted over the years. (Not answering since i am not sure). $\endgroup$ – geoffc Dec 10 '18 at 23:04
  • $\begingroup$ Was it 30% od the fuel mass or 30% of deltaV? $\endgroup$ – jkavalik Dec 11 '18 at 7:57

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