I have just started tracking how I use Tesla and what is the practical useful range available to me between charges. DS recommended charging limit of 90% and I should think about charging when range drops to 2 digits, i.e. taking 10+20=30% from the range available. This is probably not an issue for those lucky owners with home charging (what % of them here in forum?) as the happy owners will drive off every morning with full tank of juice. I have to track usage and plan ahead of my movements. I'm now tracking distance traveled against reduction in range then I'll know deficit for typical locations that I have to go. I asked DS if there is a complete charging/usage record in the car computer but she said NO (perhaps available Tesla only)! Anyone wants to share your experience on (1) useful range (2) how low you have gone in range?