I've run the XVIII for a couple of patrols. while not at 100% realism, I only use auto-fire control and no duds. Every other realism option for fuel, sensors, reapair and crew are all set to realistic.
By traveling at 1/3 speed surfaced, I was able to cruise to the south Australian coast, accomplish my mission and return to Singapore unharmed with some minimal fuel left. I would only go to standard, full or flank if stalking a contact. While the AA is deficient, the faster dive time along with the radar detection gives me plenty of time to ge to PD and stay undetected.
I really only use the Waterdrive to sprint below the layer or overhaul a target ahead. In both patrols, I returned with fuel left here as well.
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