My ketones have been between 1.2 - 1.9 the last couple days.
Those numbers work for me. To stay in that range I eat a no to very low carb breakfast. That keeps me full until late afternoon. Then I may have a chocolate fat bomb and/or a glass of wine. That keep me happy until dinner.
As long as I don't dip below 1mm, I'll stick with this way of eating. I've got less than 2 weeks until my race in Phoenix, I want to stay in NK until then.