A few claims in this thread are a little disturbing, such as the claim that the body can't convert dietary fat into body fat with low insulin levels. Feed someone 10,000 kcal of fat, it will store plenty of extra fat. The body has to do something about it.

I don't know if it is such a good idea to plan in the "metabolic advantage" into your daily caloric estimates. I know that the inefficiencies of ketosis mostly go away after a while as the body adjusts which organs need ketones and which can live off tryglycerides.