Well if you have not entered the PC on the $10 off coupon into your reservation prior to picking up the car, you will not be able to use them. I haven't found a RQ that will work besides best (state doesn't work at all anymore for anything) with these coupons. The Hertz staff is no longer allowed to enter codes upon customer returns to the rental location because their friends and relatives were getting too many freebies. If you call Hertz to complain about the rental they will send you more of these coupons. You have to make sure you have gotten them into the reservation before you pick up somehow. I am trying to go back after making a reservation and putting the PC code in now. I hope it works because if I put it in at the same time as making the reservation the rental rate is higher.