If we assume two things: the current cost of fuel is 1% of the total launch cost, and launching a reusable rocket is similar to operating an aircraft, then we can use numbers from commercial aviation:

- the cost of fuel is 35% of the total cost.

The total cost of the rocket launch then will be 3 times its fuel cost, or 3% of the _current_ expense. That's savings of 97%. Even if the analogy is not perfect and we make numerous allowances, the potential for cost-cutting by 80-90% is not inconceivable.

Again, this is based on the two assumptions above. If they are totally off, so are these calculations.