I used a combination of electric and diesel to get me where I needed to go. Mainly submerging during the day to avoid the large amount of enemy aircraft. So it saved a bit of fuel and also had the added bonus of allowing me to avoid almost all the japanese aircraft. So, yes, that would probably help you a bit.
I've also read somewhere (?) that running your diesel at around (correct me, anyone) 10kts is the ideal and most fuel efficent way to get anywhere. Too fast and you'll burn more diesel; too slow and you'll burn more as well.
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