wisdom says more oil is better but up here in Canada with our 25 L tanks I mix in 1 liter of TCW/ so 25/1 for my oldies incl my 9.5 turtle
I don’t burn much (max 25L /season) so I use synthetic bio degradable oils I get less smoke and don’t pollute as a lesser grade of oil.
Joining AOMCI has priviledges 🙂