You will always receive the best rate when you make a reservation. You will not be able to combine discounts but the best discount will always be applied to your reservation. To view all discounts being considered for your resrevation, click My Discounts in the upper right-hand corner.
Some discounts you might see are;
Early Bird: When you book your reservation 7 or more days in advance you will receive a discount.
Extended Stay: When your reservation is for 7 or more days, you will receive a discount.