Yes, critics, Koch brothers do have more leased tar sands acreage than any other U.S. oil company

From:  Daily Kos

by Meteor Blades

 Since last October, when the Koch brothers' extensive holdings of Canadian tar sands acreage were noted here after publication of the International Forum on Globalization's report—Billionaires' Carbon Bomb: The Koch Brothers and the Keystone XL Pipeline—the claims have received considerable attention, including denials from Koch Industries and attacks from right-wingers, including a prominent blog.

The IFG concluded that, based on public records, the Kochs held at least two million acres of leased tar sands land, more than any other company. Subsequently, additional research by the organization confirmed 1.1 million acres in Kochs' hands in Alberta, the most of any American or foreign corporation. That is more than 1,700 square miles. Vast by any definition. The map on the right shows the distribution of the confirmed holdings.

At The Washington Post nearly three weeks ago, Steven Mufson and Juliet Eilperin wrote their own version of the story.

The Koch Industries subsidiary holds leases on 1.1 million acres—an area nearly the size of Delaware—in the oil sands region of Alberta, Canada, according to an activist group that studied Alberta provincial records. The Post confirmed the group’s findings with Alberta Energy, the provincial government’s ministry of energy. Separately, industry sources familiar with oil sands leases said Koch’s lease holdings could be closer to two million acres. The companies with the next biggest net acreage positions in oil sands leases are Conoco Phillips and Shell, both close behind.  MORE