Rental Car discounts as per manual

[Superfly_M3]

I found this in the manual ... they can be really helpful sometimes.
Anyone tried these codes?

CarRental Discounts
Discounts are available from several car rental
companies. Benefits may vary with each
company and location, and are subject to change
without notice.
Simply use the following information to receive
your discount:
Avis:
Discount Code: B769775
1 800 331-1212
Budget:
Discount Code: T464331
1 800 527-0700
Enterprise:
Discount Code: NA24109
1 800 RENT-A-CAR
Hertz:
Discount Code: CDP#1646338
1 888 204-0234