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u can use more fuel stabilizer than is recommended. if you look at the stabil brand in particular, you can actually double the dose of the stabil if it's going to sit for a really long time. so going over a bit on the concentration wont hurt anything.
i am a big believer in the fuel stabilizers. i have seen too many gummed up carbs and varnished gasoline in motorcycles, lawnmowers, snowblowers and other small engines to risk it in the boat.
i've actually made quite a few bucks buying gummed up motorcycles. it's always the same thing: "i bought the bike and i fell and got scared and never rode it again, or i didnt have time to ride it, and it sat for 6 months, it used to run good now it won't start and i just want it out of my garage".
taking apart the bikes it's always the same exact thing. varnish in the throttle bodies and needles. once they're clean they always start, and i resell and make some cash.
i have never seen fuel stabilizers hurt anything. so i figure it's cheap insurance. my boat holds 300 gallons, stabilzer (mdr stor n start) costs about $15 to treat 160 gallons. compared to what the boat is worth it's well worth it. i hate cleaning carbs if i dont have to.
if you dont have to store for a long time you can probably get away with it. my race car sits for 3-4 months sometimes (before i remember to start it up once in awhile) and always runs fine without it....but my boat sits longer and i dont want to risk it over $30.
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