I'm not the expert on FMM, but I think the mode does not stop after burning a certain amount, but after you add a certain amount of fuel. It think the amount you have to add is enough to lower the average age of the fuel to 6 months, so I guess that would be an amount equal to whatever is left in the tank when you begin to add fuel. Subject to some minimum amount that I think is about 1.5 Gallons.
Also, I think the number of days is not exactly 365, but within a few days of that number. And it may not have been fueled the same day it was built.
Also, I think the number of days is not exactly 365, but within a few days of that number. And it may not have been fueled the same day it was built.