SAN RAMON, Calif., May 3—MediaTrac, LLC (http://www.media-trac.com), a marketing technology company providing customized frequency marketing, customer loyalty, retention and media tracking programs, announced today that Gus Johnson Ford in Spokane, Washington has achieved measurable, significant success using its LoyaltyTrac® program. Since signing up with MediaTrac, Gus Johnson Ford‘s service department revenue has increased 20%, customer defection has been all but eliminated, and the average customer....