1) Charge: Return the car with at least the same charge as you received it. Since it’s an electric car, I’ll consider “full” to be anything 250 miles of range or above, and a full "tank" will be considered worth $60. Returning with a portion less than full will incur a charge proportional to the range that needs to be replaced (e.g. 50 miles of range lost between the start and end of the trip would be 50/250 * $60 = $12).
Note: You may choose to purchase a full tank as a trip option, which is $35 instead of $60.
2) Cleaning: Return the car as clean as you received it. Otherwise you’ll be charged a cleaning fee.
Note: If you receive the car and you consider it to be dirty, then please let me know and I'll be happy to reimburse you to go to a car wash. However, you need to inform me of this at the beginning of the rental.
3) Supercharging: You are welcome to take the car to a supercharger, but keep in mind that Tesla charges for supercharging the Model 3. If you do supercharge it, I'll just charge you the total supercharging cost that Tesla charges me. That's ~$0.28-0.32 / kWh or $0.11-0.12 / mile. This is cheaper than the "tank" cost noted in #1, so it is better to do this instead!
4) No No's: No pets in the car (unless the pet is in a carrier). No smoking in the car. Nothing in the car that would leave a smell or residue. If anything is spilled in the car, you'll be charged to do an interior detail on the car (more if the cleaning is really involved).
5) Leather Interior: Be careful to not scratch the leather in the car. I've had renters in the past who have scratched it from keys in their pockets scratching the seat or rings on their hands scratching the steering wheel. The leather can normally be repaired, but it's usually a $200 or more charge to fix it.