POWER OF ATTORNEY


Know all by these present, that the undersigned hereby constitutes and appoints
each of John A. Moore, Greg L. Smith, and Magen R. Olive,
signing singly, the undersigned's true and lawful attorney-in-fact to:

1. execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer and/or director of Murphy USA Inc. (the "Company"). Forms
3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of
1934 and the rules thereunder; and

2. do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such Form 3, 4 or 5;
complete and execute any amendment or amendments thereto; and timely file such
form with the United States Securities and Exchange Commission and any stock
exchange or similar authority.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation.
The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned by notice in writing delivered to the
foregoing attorneys-in-fact.

WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 26th day of June, 2013.




   					        James W. Keyes