It's been within 1%-4% as reported by those who have exceeded 100,000 miles. Of course those units are older. AP cars, for example, have only been out for 17 months or so, and a tad less for AWD, and of course much less for those cars with the latest battery/contactor/fuse mods.
While it's normal to have the concern that you have, please be aware that what's of more direct relevance will be the practical, actual, achievable range relative to the rated range - the latter of which being calculated at 284Wh/mile. In English, if you plan to drive in a rapid manner to Yuma a lot or up into the high desert in winter, the impact can easily exceed 30% of your expected range. The aforementioned 1%-4% after 100,000 miles will be barely noticeable. Even 1%-4%/year will hardly be noticeable relative to the effects of quick hilly driving in cold and/or rainy weather. Luckily for you, you appear to hail from a nice warm, relatively flat place with lots of traffic - so less speeding for you.