This is the lowest I've let my battery get yet...but, if you look at my Road Trip totals, I could have made the entire trip without stopping to charge (I have a 90kWh battery, but only consumed 89.1kWh of juice)!
The thing to note is that I started this journey with 260+ rated miles, traveled 232.4 actual miles, but twice dropped into the 10-20 rated miles remaining. I cannot ever exceed 65 miles per hour if I want to achieve parity with the rated mile estimates.