I've been adding Sta-Bil to all my equipment and gas tanks in anticipation of winter storage. Perhaps it is just my imagination, but it seems the trimmer, in particular, starts more easily, and idles smoother. And, no, it shouldn't have needed a tune-up, because I just had my dealer do one on it perhaps 6 hours or so ago. I was wondering if anyone uses Sta-Bil or another fuel stabilizer all the time, and if you figure it is worth the effort or expense. Thanks.