http://www.airforcetimes.com/news/2010/10/defense-kc-x-tanker-capacity-101910/ Fuel capacity pivotal in tanker bid: experts

Fuel capacity will be a major factor in deciding the outcome of the Air Force’s $35 billion KC-X tanker competition, which will likely be the Air Force’s last tanker buy for decades, according to an influential analyst and a former Air Force three-star general.

[...]
When looked at through this prism, “some differences” between Boeing’s updated KC-767-based offering and EADS’ larger Airbus A330-based offering could “really jump out” depending on the scenarios Air Force KC-X evaluators look at, Grant added.

http://www.airforcetimes.com/news/2010/10/defense-kc-x-tanker-capacity-101910/