Shell in Georgetown (4610 N IH-35)

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Looks abandoned, but it's not. As sketchy as they come, but cheap gas. Expect most pumps to be out of order and the parking lot to be full of potholes. I've never been brave enough to go inside, so I can't say as to the quality of the store itself. Makes for good people watching though, so many mutants you'll feel like you're in a dystopian future SciFi!

regular high dollar gas

Costco Gas has always been great. Good location, no better match on price. You’ll eventually save if not exceed the membership costs by buying gas there.