Hey Chief. The ratio is 40:1 and I always add Marine Stabl to a fresh tank right away. I'm using the remaining 1/2 tank from last season, combined with a somewhat dirty carb, which makes for a somewhat noticeable smell at the start. I haven't fogged the carb yet this year. Also, I refer to all boat motors as stink pots, but that's just the amateur-die-hard sailor in me.