Turn off anything that might keep the car awake:
1. Sentry mode (this will keep the car awake constantly, causing 20-40 miles of range lost per 24 hours, so turn it off)
2. Cabin overheat protection
3. Dont "check on the car" via the tesla app more than once or twice a day, every time you do it wakes the car.
4. Ensure any and all third party apps that can access the car are configured properly to not wake the car (if you have any of those)
If you make sure the car is not being kept awake, or woken needlessly, you should expect 2-5 miles per day lost. So, 14 to 30 miles in a week.. probably closer to 14 than 30. If you have sentry mode on, though (for example you will lose probably 20 miles per day.