At any rate the fuel would probably be under 200 gal in total.. enough for 10-20 hrs of hard running... At least that is what I was thinking...
What about regular motoring and charging
the batteries? This 200 gallons would be in addition to what ever you care to call standard. At best that might amount to a 200 nm range. Anything moving toward you is probably moving faster than that and if it is close, the weather
it generates before it won't be smooth water
. Maxing at about 9 knots sort of sounds accurate, but all that could go down in heavy weather
. You really are in no condition to out run anything you can't know about far ahead of time. I think at that point you could have made a better decision to bail out earlier than the 10 to 20 hours later your high speed range affords.
invested in better weather information and routing services would carry a better return. Running the engines at very slow rpms for normal situations is not always in your best interest either. The extra maintenance
and higher fuel consumption
just seems like an idea you would regret. Given you are not really spending money
a lot of better ideas come to mind.