Somewhat confusing implementation. Specifically, with all the 'control' available over the 'rate adjustment,' I can pretty much make this estimator show any number I want it to. While kind of fun, I'm not sure how that's particularly valuable.

What is the 'real' or most valid setting? Am I better off with the default 80% (which, even at this setting, wildly disagrees with the Apple webpage) or pushing it all the way to 100%? What setting is everyone else using? How can we even begin to gauge the validity of the data?