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A couple points of clarification:
The Costco branded AMEX does yield 3 or 4 percent cash back at most gas stations including Costco. Fuel does not count towards the Executive rebate.
Also its a reasonable card at 1% cash back as there is no annual fee- so if you have a paid rewards card there is a 'breakeven' point to where it makes sense to have a free vs. paid card.
Will need to look into this Office Depot thing a bit more