I have a couple of coupons I got from Hertz last time I filled out one of those Gold "How Do We Rate?" surveys that are for "$10 Off any Hertz Rental." They don't seem to have too many restrictions; two of them can be used at once, and it doesn't say anything about blackout dates, although it does say "Advance reservations required using PC# xxxxxx."
I've noticed that when making reservations on-line, it won't accept the PC number if I am using the "FRDM" rate code, but it has no problem taking the PC number if I choose the Best Rate option (which, of course, is not the best rate I can get).
Will I have any problems if I just give them the coupons when I return the car without having it noted on my reservation? Are there any other ways around this? Are the coupons really good on "any Hertz Rental"?