Brentwood, Tenn., December 28, 2010 – Delek US Holdings, Inc. (NYSE: DK), a diversified energy company with assets in the petroleum refining, marketing, supply and retail industries, today announced that its wholly-owned subsidiary, MAPCO Express, Inc., has entered into a five-year, $200 million revolving credit facility (the “Facility”). The Facility extends and increases the existing revolver and extinguishes an associated term loan, both of which would have matured in April 2011.

The Facility is structured to include: (i) a $200 million revolving credit limit; (ii) a $50 million letter of credit sublimit; and (iii) an accordion feature which permits an increase in borrowings of up to $275 million, subject to additional lender commitments. The Facility will mature in December 2015.

The primary purpose of the Facility is to help finance working capital requirements and the strategic growth of the Company’s retail segment.