Yes, depends on speed.In TMO "Ahead Standard" is the most fuel efficient setting, for the speed.As in RL, it's made so can transit to and from patrol area at Ahead Standard, patrol areaat ahead 2/3 or 10/5 knots .Of course, if your area is far off, make adjustments for transit speed, in a Gato or Balao, if long ways to go, ill drop speed to 12.5 knots or 13 even, still a decent transit speed but saves a little more fuel, gives a couple more days in station.Of course this is more a concern in 41/42/early 43 as by then plenty of places to refuel so can transit at high speed.Also, dont rely on range estimate if batteries are charging, that will throw off the accuracy.Sea state also affects this as heavy seas will slow your boat down but youre still burning the same amount of fuel, just for less range.
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