I tried halving the mix or there abouts and tried 65:1 with amsoil but it seemed off underpowered/fat/rich. Went back to my normal mix for everything else 90-95:1 and bobs your uncle
If no one has pointed this out amsoil saber professional passes all the standardized tests for 50:1 ratio but at 100:1 ratio 🤷♂️ I run all my equipment at 90-95:1 including a gold series 6.5 duraforce lawnboy