KenV-'There are four wing tanks on the C-17. And they feed fuel to their associated engines equally. The outer tanks are not kept full for wing bending relief.'
I beg to differ Ken, the outboard tanks on the C-17 are kept full until the inboards reach the same level then they all come down together.
You are of course correct. I was not clear. The inboard tanks are larger than the outboard tanks. Fuel is fed from the inboard tanks to both engines until the fuel volume is equal in the inboard and outboard tanks. From that point both tanks feed their respective engines equally, with the outboard tanks not kept full for wing bending relief.