Weather is a significant factor even in an undamaged boat. The higher the wind/waves, the more fuel you waste trying to churn at high speed. I always give myself a 10% extra margin on the return trip and use ahead 1/3 when the wind is higher than 10 m/sec. This higher margin will allow for some high speed attacks or evasions requiring long charging times as well as unusual weather on the way back. You can't always count on the weather being the same returning as going out.
-Pv-
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