Hello, this is my first post. However we have owned a Parker 2520 w/Extended Cabin five years. Engine is inboard. IT IS AWESOME FOR OUR PURPOSE; running sailboat races. It belongs to Lake Norman Yacht Club; We purchased the boat for the club 5 years ago. We are near Charlotte, NC and the boat came from Massachusetts A1 Marine. Trying to find out what the Fuel tank capacity is. We were told it is 80 gallons, but when we fill it up when "Half full by the gauge," we put in about 75 gal. Something or some one is incorrect??