If you can find it, opt for the non-ethanol gas. It attrcts water and has fouled many carbs down here in the south, just from the humidity. The non-ethanol costs a bit more, but well worth the price if you don't have to continually get the carb cleaned or rebuilt. I also use it in all of my other gas powered tools, (lawnmower, weedeater, chain saw, etc) Hope your boat build goes well, and you have years of enjoyment out of it.