Advantica Restaurant Group, Inc. (OTCBB: DINE) yesterday reported same-store sales for company-owned restaurants during the four-week period ended April 25, 2001, compared with the same period in fiscal year 2000. Denny's For the fiscal month of April, Denny's company-owned restaurants posted an increase in same-store sales of 2.6%. The increase included the impact of a 2.5% higher average guest check.