We rented an electric vehicle from Avis in Las Vegas and they said 75% or higher was ok. YMMV.
We were assigned an electric vehicle (chevy bolt with a range of about 250 miles) by Avis in Maui, and then they tried to add on an upgrade fee. after seeing the car we were assigned we tried to go back and change it but there were about 50 people in line. the ev chargers at the westin were not working but there were some in the park next door but they weren’t working either! We had to call avis to ask how much of a charge was required on return and it was 70%. They told us there was a charger at the avis rental across the highway from the westin. There were also chargers in the sheraton maui hotel parking garage. After a few days the westin chargers were fixed and we were able to charge at the resort and return with over 70%. It was a hassle but worked in the end.
I have read very mixed reviews about renting an electric car on Maui. Most have said it's not worth it.
Turo is great until something goes wrong, and then it usually goes terribly wrong. Unlike using a rental company, if something goes wrong with the vehicle or if it is not ready on time, etc., there is no backup for you so you are left high and dry and on your own. You just have to factor in that risk when deciding whether or not to use them.