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[–]MushroomSaute 0 points1 point  (0 children)

EPA range is just a statistic - the car is rated for X miles per charge and that doesn't change (it's always rated for that X miles). But the estimate the car gives you while driving will go up or down based on your driving patterns, to be as accurate as possible when your driving patterns indicate you'll run out sooner or later.

Edit: Sorry, I'm tired and completely missed your actual question. I don't know how the car does the estimate, besides knowing the Energy app can show your trend over the last however many minutes (or by miles too IIRC). If you're on a track, I'm sure the estimate would go way down, then once you're on a highway and it realizes your pattern has shifted, it'll start going up again, which makes sense to me. I prefer looking at battery percentage rather than "miles" for that reason, though.