Not in the sound, but several years ago I read an article about some folks going offshore to fish for tuna. As they rig up (in a big boat, 35'+ long), two guys come putting up in a 12' aluminum cartopper - this is 5 or more miles off shore. They had two gas tanks in the boat. They told the author they figured they'd motor out until the first one was empty, and use the second to get back to shore. No word on their success or failure, but mighty stupid to be out of sight of land in a boat that small.