no these are b4 insurance, liability
1)you cant use your cc for liability, you can only use your cc for collision which i s usually referred to as LDW, and only for a max of 15 days on most cc and on a car that has a max msrp of $50,000 .
For longer coverage and coverage for a more expensive car go to
https://www152.americanexpress.com/premium/car-rental-insurance-coverage/home.do?source=CCSG2) the costco coupon doesn't appear when i go thru your prompts, i'm not sure if you have to print it up usually they're paperless coupons
(sorry I don't know how to quote properly on a treo)
1)I knew that liability is not available with cc sorry for not explaining my self.
2)the costco coupons are NOT paper less officialy u need it there beshas rental. What I did with costcos $ off coupon was, I booked with coupon # I knew they wouldn't take it off unless I ask them after the rental but I didn't ask them bec I'm not a costco member, then after the rental I called customer service & they said to mail in the coupon, so I told them I gave it to the rental agent when I picked up the car, officialy they called the location to see if I gave it in (not possible the airport would remember) & they took off the $!! Anyways the coupon should be on costco.com click on costco travel on the top of page then or car rentals chose avis & it should be there.