Ok , If you take your spool off or the fixed length short sections of trimmer line and keep them submerged in a container of water when you aren't using the trimmer you will be absolutely amazed at how much longer your trimmer line lasts. I mean up to 10 times longer ! I prefer to use a fixed line head on my Stihl FS80 + FS65 and I can typically do a whole yards perimeter , side walks + fence lines , flower beds on 1 set of 2 12" strings (095) on my FS80 and usually do another yard or more on the same 2 pieces of trimmer line just by keeping them in water ! I never use anything smaller than 080 line , I feel the smaller sizes just aren't practical to begin with. And don't waste your money on cheapo trimmer line , I really like the Grass Gator Shaped line, Diamond Edge line and the Twisted line in various brands.