My Model S is almost at 40K miles. I decided to charge it to 100 percent and see how many miles it charges to. Drained the battery down to 22 miles remaining before plugging in Added 234 miles = 69 kWh I'm very happy with the battery life! The battery is definitely not an issue with the model s, ... just wish they can figure out the drive unit issues. Although after my last replacement in January, it's been running perfectly!