EXHIBIT 99.2


              CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                          AS ADOPTED PURSUANT TO
                SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Form 11-K for the Giant Industries, Inc. and
Affiliated Companies 401(k) Plan (the "Plan") for the fiscal year ended
December 31, 2002 as filed with the Securities and Exchange commission on
the date hereof (the "Report"), I, Mark B. Cox, Chief Financial Officer of
Giant Industries, Inc., certify that:

    i.  The Report fully complies with the requirements of Section 13(a)
        or 15(d) of the Securities Exchange Act of 1934; and

   ii.  The information contained in the Report fairly presents, in all
        material respects, the financial condition and changes in financial
        condition of the Plan.


By: /s/ MARK B. COX
   -----------------------
   Mark B. Cox
   Chief Financial Officer

Date:   June 30, 2003