POWER OF ATTORNEY

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

(1)  prepare, execute in the undersigneds name and on
the undersigneds behalf, and submit to the U.S.
Securities and Exchange Commission, the SEC, a
Form ID, including amendments thereto, and any other
documents necessary or appropriate to obtain codes
and passwords enabling the undersigned to make
electronic filings with the SEC of reports required
by Section 16(a) of the Securities Exchange Act of
1934 or any rule or regulation of the SEC;

(2)  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 (and any other Form that may be required by the
Securities and Exchange Commission) in accordance
with Section 16(a) of the Securities Exchange Act of
1934 and Form 144 in accordance with Rule 144 of the
Securities Act of 1933 and the rules thereunder;

(3)  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 Section 16(a) Form
or Form 144, complete and execute any amendment or
amendments thereto, and timely file such form with
the SEC and any stock exchange or similar authority;
and

(4)  take any other action of any type whatsoever in
connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in
the best interest of, or legally required by, the
undersigned, it being understood that the documents
executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall
be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in
such attorney-in-fact's discretion.

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, hereby ratifying and
confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully
do or cause to be done by virtue of this power of attorney and
the rights and powers herein granted.  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 and Rule 144 of the
Securities Act of 1933.

This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to make
filings pursuant to Section 16(a) and Rule 144 with respect to
the undersigned's holdings of and transactions in securities
issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing
attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 14th day of January,
2016.

		      		David B. Miller