Has anyone used the new National DC coupon successfully? Do you absolutely need to include it when booking or can you present it at the time you pick up the car? I have a really good rate for full-size EA using the old Disney Club code (made it last October) I hate to tamper with it just to save $20. I might call National directly to see if they can apply it to my existing reservation. When I try to book a new reservation.........I can sometimes get a lower daily rate but I can't beat the $169.99 weekly rate. It seems when the daily rate goes down, the weekly rate jumps up. And, that site is so quirky......I never get the same answer twice! I am traveling 4/14 - 4/23.