We are news owners of a 2005 Beneteau 373 and have spend several weekends aboard the boat for the first time at Kentucky Lake this spring. Last weekend, we were on the boat for 3 nights 4 days. I filled up both water tanks on the first day and by day 3 we had already run down one of the tanks, forward tank, which I refilled. On day 4 we emptied out the 2nd aft tank. There were 3 adults aboard and we ate most of our meals on board so there was a lot of kitchen and bathroom water usage. I was quite surprise that we could go through that much water in just 4 days. Is this normal or excessive water usage?