Getting the biggest discounts at grocery store gas stations

[Spellmen]

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a gas station in pittsburgh teams up with a local grocery store, you get $10c off per gallon for every $50 you spend in store


just mentioning this because the rate seems slightly better than what has been shown so far

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Giant Eagle (grocery store) gives discounts for gas at GetGo's (they own them), I assume that's what you mean.