GARYVILLE REFINERY EXPANSION

Marathon's estimated $3.2 billion Garyville, Louisiana, refinery expansion project will increase the crude oil refining capacity by 180,000 barrels per day. Completed in 1976, the Garyville refinery is the last grassroots refinery constructed in the United States and has consistently been ranked as one of the most efficient refineries in the nation.

The Garyville expansion is an example of Marathon's commitment to making superior investment decisions for shareholders, while building energy infrastructure that will supply the growing needs of U.S. consumers. The expansion will provide an additional 7.5 million gallons of clean transportation fuels to the market each day.

In addition to adding substantial supply to the nation's marketplace, the expansion investment will also provide significant benefits to St. John the Baptist Parish and Louisiana. It is anticipated that the completed expansion will add approximately 75 to 80 new full-time contract employees and approximately 200 new full-time employees.

The construction phase will require an average of 2,000 workers, with up to 4,000 workers at peak period. Startup of the refinery is expected for the fourth quarter of 2009.