I use a Stihl FS55 (since '98), and string trim 1450 feet almost every time I mow the yard. I'm using a yellow string I picked up (a large pack) at Lowes some long time ago. I find the yellow string does not last very long. Before that yellow string, I recall using an orange string that did very well. I used the last of that yellow string yesterday. I found that I was bumping the head for more string about every twenty feet. A bit much, I find. SO.... I'm reaching out to those who know. What is the most reliable, strongest .095 string out there...??? Does that multi-edge string really work....???