Body on white is 30 pounds lighter. They probably lost 30 pounds in the battery. I’m going to guess pound-for-pound an S4 only ends up being 120 pounds lighter, so about 3800 with fluids. FWIW I’ve got my B8 down to 3590.
http://www.autoblog.com/2015/06/28/2016-audi-a4-official-photos-video/