The question is whether and when the use of fuel as a heat sink starts to affect the mission. For instance, do I need more fuel at the end of the mission than I'd normally need as a reserve, overhead the base or carrier? Can I manage my fuel/coolant so that on egress, I can shed heat through the skin and arrive over the base within temps and with a small fuel load?
As noted above, the last thing that the B needs is any range constraint...