06-22-2011, 06:37 PM
Amex Blue Cash. But it is tiered. I haven't checked recently, but it used to be the first $6500 was only up to 1.5% back, then after that groceries, gas and drugstores are 5% - no limit. Warehouse clubs do not count, however. But there is a Costco Amex that is not tiered like that and only gives up to 3%. I have both cards and use them strategically.