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Huh? 

a.  it is less than 30 tons (27 or so)

b.  A winged booster with no fuel is useless.  It can't land on a barge.  It needs propellant to get it back to the launch site/runway

C.  Falcon 9 can use that propellant to ensure success on a bad day or to lift more payload for an expended mission.


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