[CaptBenson]

You might also look to see if you have more than one ship. I read somewhere that the speed your flotilla goes is a function of the drive on your biggest (leader?) ship and an average of all the drives sorta. I don't know the function, but I know it considers all of the ships in your flotilla that can support drives. I wonder if the plow considers those other ships, as well, and says 'they don't have a plow, so it shouldn't work as effectively for the whole fleet.' That's my guess on what's happening or a combination of the two. I'll try to test it the next time I get the plow.