As soon as the patrol starts, plot a 4000 km circle from base. Knowing that 25% of fuel gets you to 4000+ at ahead 1/3, you might as well have a limit to your progress, and never fall into fuel headache ever...
On a side note, I once had to hump it back to MW in 2 knots speed, and pretty much your situation isnt that delicate. I suggest you do some shakedown at 1000 km increments, and record fuel consumption at various speeds each time.
And make sure the crewman who increases your range (if any) is in the engine compartment.
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