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Where can I go to find Murphy gas stations on certain roads for a road trip? - murphy go kart frames

I am planning a trip of 6 hours north. To save money I am willing to use these stations have Walmart Gift Card in Murphy, which is usually located right next to Wal-Mart won. How do I find it? Is there a place where you can find some stations on certain roads? I am in need in the North I-79 from NC to PA.