I had one mission where I has to go the last bit submerged because I ran out of gas. I just needed to get to that magic 25nm point where I could dock.
Perhaps that 25nm is simulating a tow if I need one?
Any damage to your fuel tank makes the "estimate range at current speed" very inaccurate. Abort and get thee to a friendly port soonest!
Gatos do not come equipped with oars, I found out.