Per Flash's stats, the KC-767 has as much fuel as the KC-45 (aka A-330) - which is slightly more than 200,000 lbs. What it can't do is haul as much "stuff" or carry as many troops. As Wingnut asks above, if non-gas capacity was such a big deal in the AF's decision, why didn't they ask Boeing to go to the -300 or - 400 airframe? Given the state of the economy, I see Congress making a real stink over this. If the original intent was to get 179 airframes of a KC-767 size, maybe the best answer/compromise would be to split the baby & buy about 2 wings of KC-767's (~60) and about 3 wings of KC-45's (~90). Am not sure of the number of a/c in a USAF tanker wing, however.
Oh, I also think the USAF is the only air force in the world that uses the "Iron Maiden" boom - everyone else can tank and uses the drouge & chute system.