I'm a courier and I fill up every day, but I would never wait more than a couple minutes. My time is more valuable than that.
I do check Gasbuddy every day though, to see which station on my route have the best price. I support Co-op, partly because I do deliveries for them, and the gas bar by the Heritage Costco is usally 5-10 cents cheaper than their other locations, so that's my usual go-to.
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