as someone who makes 1 litre at a time of 25:1 mix for my Mitsubishi TU-26 line trimmer and Victa mowers, it is 40ml of the anti engine destroying nectar to make that mix up.
125ml sounds about right for five litres of 40:1.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!