Half a tank left equals turning around and head for home. Leaves a bit in reserve as well. You never know what might be necessary. You might be lucky, catch a task-force, but need to do flank to catch up. Or get unlucky and some MoFo shoot a hole in your hull and make you leak fuel.
In either case, half a tank minimum before turning around and head for home, leave you good manouvering room to handle most situations. Especially later in the war where subtenders and bases are more plentiful.
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