I have read that also. But I also just recently ran across this. This is from the article link below. Pretty interesting if true.I understand they only had enough fuel for a one way trip also.
"Nevertheless, while the Japanese Naval General Staff instructed that each ship be given only enough fuel for a one-way trip to Okinawa, harbor officials risked execution by disobeying this order and refueling the entire SSAF to capacity, giving them more than enough oil to return home if they somehow survived."
Death of the Battleship: Sinking the Yamato and Musashi