If you are running the latest RFB patch (and you should be, it is awesome), LukeFF and his team changed the throttle around to more historical settings. Standard speed is about 16 knots and 2/3ds is around 14 knots. Hitting 10 knots for best efficiency surfaced has to be done manually, same for lurking at 1 knot submerged for battery endurance.
I read about it in the readme, it was very clear, right there in front of me and for some reason it still didn't register in my head, which lead to a rather short patrol and keeping my fingers crossed as I got to Midway on fumes.
If your used to running standard throttle from previous patches, that could well be what is killing your fuel, 16 knots sucks down the diesel.
I think RFB is awesome, love the changes in the patch and appreciate all the hard work that goes in to the mod, but I must confess that I had to sit down and figure out how to mod the throttle settings back to what they were prior to the patch. Apologies for that guys, but the throttle changes just seemed like it added too many mouse clicks to normal operations for my own personal tastes.
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