25% fuel savings doesn’t mean you convert the excess into payload. It just means you need less fuel. The Saturn V could get ~50 tons to the moon using ~3,000 to

25% fuel savings doesn’t mean you convert the excess into payload. It just means you need less fuel. The Saturn V could get ~50 tons to the moon using ~3,000 tons of fuel. A 25% savings means you get 50 tons to the moon using ~2,250 tons of fuel.