I wonder if you have to return the car at the same charge level? Also, I wonder how supercharging will work. I assume Hertz will upcharge you. Let’s them charge per mile..
If the below post is true, Hertz expects the car to return with at least 10% charge. The cars can use superchargers and Hertz pays the bill.
Here is post claiming to be the Terms & Conditions of Hertz's Tesla rental contract: