The KC-10 can burn all its fuel or offload all but a couple thousand pounds.
We can easily burn the JP-7 fuel that the SR-71 used, it just doesn't
lubricate the fuel pumps as well. I assume the KC-135 is the same. Not sure
about the KC-130 with Benson tanks in the fuselage.
Curt
U. S. Air Force, almost retired

There was a mid air explosion of a KC-135 about 15 years ago. They had
offloaded all the fuel they could, and the pumps no longer had that fuel for
cooling. Something got really hot, and the remaining vapors ignited...


Ron
Pilot/Wildland Firefighter