Thought I'd revisit this thread and post some data. I've been keeping above 55 (random number by me, I think it's the threashold for what is called "optimal ketoisis" but I could be way off. Also comparing it to pee sticks.

I plan on fasting for 72 hours from a few hours ago. I'll try to get a reading then and post. I suspect it will be higher than 80 but maybe not by alot. I have a lot of fat that can be used so I will not be starving.