[LakeSnake]

Being a car guy I have read a lot about the ethanol issue and long term gas storage. In short the marine stabil is just a stronger version of the regular stabil. In theory because a boat is near the water and will be more likely to have condesation issues.

I would recommend the marine stabil as it is one of the few gas additives that does not have alcohol in it. Star tron and sea foam do have alcohol (if my memory serves me). The problem with ethanol gas (in addition the corrosive effects on older gas tanks) is the alcohol in the gas separates over time and is more likely to attract condensation. Adding more alcohol (star tron, etc) will only make the situation worse.

If you are going to use the gas within about two months then there is really no need to use an additive - but a lot of people do anyway (including my self) just to be on the safe side (it won't hurt). I add the "called for amount" with each gas purchase - some times a little more. But I would no go overboard as that stuff is expensive.

The most important time to add is when you are not going to use the gas within the two month period (i.e. winter storrage). This is when I would suggest making sure the gas tank is FULL to the brim (or really close) and add a good healthy overdose of stabil (while filling up so it mixes). Make sure the tank is full - less room for air and thus condensation - and water build up.

I have used this technique to store a car for the winter (5 months) and had no issues - stared right up in the spring. Just use up that tank of gas befoe buying more - to get rid of the old, overtreated gas.

Hope this helps - sorry I guess it wasn't really the short answere either.

P.s. - I would also recomend the regular stabil in other machinery (lawn mowere, etc) that gets stored for a period of time.