General Mills Inc. ( GIS ) is all set to report its first quarter 2013 results before the start of trading on September 19, 2012. GENL MILLS (GIS): Free Stock Analysis Report To read this article on Zacks.com click here. However, the addition of Yoplait International to the business mix, higher input cost inflation and lower U.S. retail volumes dragged the quarter's adjusted gross margin down by 140 basis points (bps) to 37.2%.