I don’t have one of those “fancy” boats, I have a removable 6 and a 3 gallon tank, I run my boat in winter with stabile in the 3 gal tank, and come spring, I dump that gas into my truck and fill them both back up with fresh gas (and seafoam on the first tank). Otherwise everythign else I’ve read says keep a gas tank full if you are storing things for a longer period of time, something to do with condesation in the gas tank, which I can’t explain (I’ve only been told), which sucks because that’s a lot of stabile gas to burn though…