I have been using the "better" of the Stabil products in small engines and stored bikes but have found that even that treated fuel causes problems from separation in small engines. On chainsaws the carb diaphrams go bad quickly these days. Stihl specifies 89 only for there stuff. Better to just get it all out in an unused engine tank. No idea if Startron works for long term storage. I've tried both of Stabil's products & Seafoam in my Kohler engine on my sawmill & if the 10% fuel sits very long it causes problems with carb & fuel pump.
"If I had my life to live over,I'd dare to make more mistakes next time...I'd relax,I'd limber up.I'd be sillier than this trip, take fewer things seriously, I would take more chances... take more trips...climb more mountains...swim more rivers...eat more ice cream." Jorge Luis Borges, at age 85