Not all gas stations actually verify the ZIP Code. Here you can enter 11111 or 00000 or anything. Some Canadians have reported using zero right filled Canadian postal codes. Frex, L3G 4N5 would be entered as 34500. There is no way to my knowing, if the station verifies.
I pass that one because most self pump stations where I am are 24/7 but the attendant is only there 8-5 or so. If you need to fill at 2300h, this may work for you guys.
As to the disposal, I"m surprised that a fueling vendor doesn't have a fuel disposal method of some sort.
Why be born again when you can just grow up?