I often hit my OG numbers pretty closely, but I seem to always finish well below estimated FG. Most recent example was a rather simple all-grain American Amber. Beersmith3 estimated OG of 1.046 & I was 1.047. BS3 also estimated FG of 1.011. I used a single pack of Wyeast 1056 that was about a month old. No starter obviously. After 4 days my hydometer measured appx 1.004-1.005. I'll test it again today or tomorrow, and will probably keg it if it remains at that FG meaning it was just 6 days from fermenter to keg. I'm just curious how common it is to almost ALWAYS finish below estimated FG? It seems all of my batches follow that pattern. No fancy fermentation either. Just in my dark basement always around 66 degrees. Anything I need to worry about or no-big-deal?