POWER OF ATTORNEY Know all by these presents, that the undersigned hereby
constitutes and appoints each of Greg L. Smith, Ashley Smith and
Mallory Wynn, 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 undersigned?s name and on the undersigned?s
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 8th day
of January, 2025.




James McPhail