Not sure where you're coming from about running out of fuel?? If you're carrying x amount of fuel, x amount is the same whether its in on tank or two tanks.
My Silverton 34C had two tanks, but no crossover, 45C has one tank. As mentioned previously, when you get fuel, I assume you're filling both tanks or one tank from the same fuel station. With that said, if you get bad fuel, it does not matter if you have one tank or two tanks of bad fuel. If I had a fuel leak, one tank or two tanks I would not run the boat and would call sea tow. Personally, I would be more concerned about what color my cup holders were as opposed to one tank or two
Depending on your boat, one tank replacement would more than likely cost you less than two tanks. If one tank leaks, obviously the other tank will follow and need replacing. In my Silverton 34C, the fuel tanks (2 of them) were mounted on the outsides of each motor. If they needed to be replaced, both motors would need to be removed to do so. With the 45C, the one tank is mounted in the stern of the boat and could be removed without touching the motors.
Fun Time,
Your question was a good question, but unless someone else chime in on an advantage, I see known based on my experience. Good luck with the hunt on another boat.
Walter