I just drove home from our lake home 138 miles north of us and when I got about 6 miles from home my 2015 Models S 85D started warning me about the range/battery level and slowing down, first to about 55mph and then two miles later only about 35 mph max. I made it another 4 miles after the warnings started to an off-ramp and the car stopped with 26 miles left on the range. I started with 224 miles of range and drove 136 actual miles of all highway/freeway at about 65-75 mph with only two or three stoplights. I make this drive about 20 times each year and made it yesterday and had the normal 45-65 miles of range left when I arrived. I just had it towed to the Tesla service center which thankfully is 2 miles from my house. The gave me a loaner and am waiting to here back. My full charge range reading was 272 miles when new 5 years and 99,500 miles ago and now max range reading is about 234 miles. I've had basically zero issues so far other than all 4 door handles have been repaired.
It will be interesting what they come back with and I'm obviously hoping it's a new battery. I've used a Supercharger only 6 times in the last 2 years and at home, we charge at only 48 amps. I almost never charge past 80% or run it below 60 miles on the odometer.