Lowest I’ve seen is 6%.
I once got down to 10 miles of range. That’s as low as I ever want to go.
Had some soldiers in my unit run our fleet Lightning to 0% on I-10. It was a disaster. We had to tow it 60 miles, and it never charged past 122 miles of range again.
Hit 1% with 1 mile of range left. Surprisingly, I didn’t lose any power.