It is a good idea to maintain your battery level between 20% and 90% for optimal battery health and longevity. For daily driving, it's common to charge the battery up to 80-90% to maximize range while preserving battery health. If you're planning a long trip, you can charge it to 100% to get the maximum range, but it's not recommended to keep it at 100% for extended periods to avoid battery degradation. When the battery level gets below 20%, the remaining range might become a concern, depending on your trip distance and the availability of charging stations. It's a good idea to start planning your charging stops when the battery level is around 20-30%. Keep in mind that Tesla's navigation system can help you find Superchargers and other charging options along your route, so you can plan your charging stops accordingly.