Sounds like the sensible thing to do. Lasts longer, better mpg, better quality fuel. Cost is going to be negligible as you’re barely using any petrol.
Like Kezo, I use fuel stabiliser in lawn mower along with Shell V-Power and never have a problem. Well, apart from this year when I ran out and thought it would be ok which it wasn’t when wife went to do first grass cut of the season as it wouldn’t flippin start! 😆