What is the "rule of thirds" for fuel on a passage?
A full fuel tank at the start of a passage, divided by dashed lines into three equal parts numbered 1, 2 and 3.
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One third to get there, one third to get back, one third in reserve. Plan to use no more than a third of your fuel on the way out and a third to get back, keeping a third in hand for foul tide, head seas, a diversion or a flat calm.
