The Shells around me have the highest prices AND the worst fuel from what I can tell. Lukoil was the best I've used, from one station on a backroad near my old job but I stopped using them after several dozen cars died from water in the gas purchased at a Lukoil nearby (not the same one). BP was about the same as Shell. Chevron was next best followed by Speedway. Mobile was never anything but expensive so I've avoided filling up with them for years.
Now I fill up at a station near my house which I don't know the name of and isn't listed on google maps. It's the cheapest I've seen around and is decent. I'm due for a fill-up by Friday so I'll try to remember to keep the receipt ('cuz I won't remember otherwise)
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