Costco Amex has another card: TrueEarnings
3% dine in rebate, 2% Traveling (not sure what counts as traveling) and 1% for everything else, including at costco..

https://www124.americanexpress.com/cards/loyalty.do?page=trueearnings&Card_name=TrueEarnings&link=CARD_SELCTOR

Very interesting.

I carry the "old" CostCo/Amex cc but I might have to upgrade to this.

Thanks for posting this :)