LittleWing, I can't help you there! We left New Orleans to Belize City on less than 15 gallons!! The Orion (as mentioned) are heavy on their own! I DO have a aux H2O Vetus bladder tank fwd for 20 gallons of water. Port side under the V berth boxed between the head and fwd bulkhead under berth. THat doesn't help the sailing but till I can save up for a H2O maker it works.