BEagle:
A massive 65% better than the KC-767, or 45% better than the KC-135R!
And how does that compare to the KC-10A? The USAF bought 60 of them at a "bargain" price so McDouglas could keep the DC-10 production line alive in the early 1980s. The AF has reported that the KC-10A is too large, which would imply the A330 is also too large.
It doesn't matter which new airplane fits the mission better. A mix of used airplanes can do the job sooner at much lower cost. That mix includes the A310.
GB