"one exception is when renting from an Enterprise airport location and returning to a neighborhood location, since they'll use ECARS for those."
I thought that (while Odyssey might have not been opened for the day yet), the manager might have punched me out on ECARS - impossible? I know that SAV is a strange location for National (reviews were saying it's run like Alamo LOL). It so happens that my return next day was to my neighborhood National/Enterprise, and I got 0 credit. Now, to I came to SAV from DAB (where I didn't pay for rental either), and I did get 1 credit for return at SAV. But I'm guessing if I call about the missing credit (from SAV), operator will just tell me 0 credit for "unpaid" rental