After I make my reservations I see the following line item: Coupon deductions are NOT included in the estimated total, but will be calculated and applied at the time of rental. When I return my car, the rate charged is exactly the same as the estimated rate. Am I missing a step? I have been assuming that the coupon would applied automatically somewhere in the process. Do I need to ask for the deductions at time of pick-up or during drop-off?