So I ran a tank of 50:1 90 oct E-free: HP Ultra through my FS 82.5 yesterday in some tall grass. The whole time running it I was thinking to myself that those folks at stihl really know their stuff. The trimmer is exactly $43 smoother, no more, no less. I was considering putting the $43 towards a new FS 130, but I just don't have enough tall grass trimming to justify the cost, besides already having a KM 130 R with a trimmer head and brush cutter head. I just thought I would wrap this thread up for those who may be considering the upgrade.