I drive a 250mi range model 3, I was on a road trip and had secured enough charge for the trip, according to the internal computer. Well I had 5 people total, plus a car full of luggage averaging about 85mph the whole way. Needless to say I hit 0 miles left about 10 miles from my exit and 15 miles from my house. As I got off the exit I started to notice my speed couldn’t go past 55mph. Then as I got closer and closer to my house the speed diminished. As I pulled into my neighborhood the car said turning off please find a safe place to park as I pull into my charging spot. I got about 15 miles after 0%. So I guess that’s roughly what the reserve is. It was intense as hell.