Results may very...
With some locations, paying in store doesn't count; but paying at the pump does (in general-- I haven't purchased gas at a 7-11 ever to know if their stores work the same way).
The 4% is granted based on the coding... for instance, my local mega gas station (not mentioning names) codes as convenient store inside and at the pump (you don't get 4%).
The station next door codes as a restaurant inside (Discover pays extra for gas this way) and as a gas station at the pump.
And... my heating oil supplier -- they code in store and at the pump as a gas station giving me 4% cash back when buying 300 gallons of heating oil at $2.65 a gallon (same for small purchases too).
You'll need to experiment with your local available stations to know what works and what doesn't-- unless you live in an area that has stations that have already been tested.
From what I've read, Walmart gas stations don't code correctly to get 4%... Costco gas stations do.
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