EXHIBIT 32.2

                  CERTIFICATION OF THE CHIEF FINANCIAL OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350


In connection with the CarMax, Inc. (the "company") Quarterly Report on Form
10-Q for the quarter ended August 31, 2005, as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Keith D. Browning,
Executive Vice President and Chief Financial Officer of the company, certify
pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that, to my knowledge:

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

              2.     The information contained in the Report fairly
                     presents, in all material respects, the financial
                     condition and results of operations of the company as
                     of, and for, the periods presented in this Report.


Date:  October 7, 2005                            By: /s/ Keith D. Browning
                                                  --------------------------

                                                  Keith D. Browning
                                                  Executive Vice President
                                                  and Chief Financial Officer