I use coupons for pretty much every personal rental I do - for business rentals, I pay whatever my CDP is. When doing a personal rental, the only time it's not on the board is when I'm using a PC that starts with the number 1 (i.e. certain free days & cash-off CSR certs) - but other than that, in recent months, I haven't had an issue.

I can't believe it's becoming standard practice to ignore CDP codes - maybe at PIT or other poorly run stations it is, but in general, I haven't seen this & can't believe that this is the case...