Fast-oiler size balanced risk and capacity

Was there a loss-versus-use calculation in sizing fast fleet oilers?

Yes. They tended to be smaller because they operated nearer combat and a single loss would remove less fuel.

The size of a support ship reflects exposure as well as carrying efficiency. Fast oilers operate closer to the fighting fleet than slower replenishment tankers. Making them smaller helps speed and limits the quantity of fuel lost with one ship. The design choice balances payload against the tactical risk inherent in the final delivery leg.