Etecs on the "ordinary" TCW3 setting average about 50:1, on the XD100 setting they average around 75:1. Modern autolubes will vary the oil ratio depending on running conditions. At tickover, oil consumption will be negligible, hard acceleration dramatically increases oil useage. If you are continually on & off the throttle (rough seas?) oil use will be higher compared to a steady cruising speed.
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5