A neighbor of mine had an F600 installed shortly after our install was complete two years ago. I constantly notice smoke billowing out of his chimney, not just for 20 min upon reloading - for hours. I've even had other neighbors ask if we were burning this year because they never see smoke rising up from our chimney like our neighbors. He's even mentioned to me that the stove hardly makes a difference in his home, but his comment was during a neighborhood poker game and it wasn't appropriate for me get into it at the time. We're burning wood from the same source, which has been stacked for 15 months. I'm using the same wood keep and keep our house temps easily at 75, burning more like shoulder season. (very mild winter along the Mid Atlantic) My chimney sweep tells me everything looks great, whatever I'm doing, keep it up. (I like the piece of paper that proves it was professionally maintained - just personal preference) How have any of you approached a friend/neighbor and offered a little advice? I don't want to come across like a know it all, but I feel like it's a matter of efficiency, and more importantly, safety.