I have a stihl fs80r & a homelite st185 . I have always used 40:1 ratio in my gas. I recently picked up a redmax bc2001 and read that it is 50:1- so I research a little more and find out that old homelites are 32:1 . All 3 seem to run fine on 40:1. Does it really matter? I've used them for several years with 40:1... ?