I've chartered 4 times with the Moorings on a PC each time. The way they work it is call them when at the mouth of the harbor they have one of their employees board your boat and take it to the gas dock and refuel. You can pay for the fuel and leave the boat there or if you prefer they take the boat to a dock for you and you can leave there. If you fuel someplace else you will still go through the same routine at the marina.. I don't see any advantage to fueling someplace else.