I think that the fuel companies vary their mixtures so often that they probably couldn't give you a decent recipe list for any
particular tanker, as the change the formula as the seasons change anyway, and the sticker says may contain up to whatever
percentage of ethanol. I have had folks bring back a trimmer in the spring, that I worked on last fall, complaining that
the trimmer won't start, etc.. While they are still there, I'll dump their tank in jar, and pour a dribble on some paper in the burnpile, then step back and fling a match at it, it usually takes several tries, and then takes off like old kerosene...