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I run sheetz and snappys(its in town so I get it 90% of the time) gas. Both are the same which it dont matter because its the 2 closest places to me. I have run sunoco and bp but it seems to be the same also. Shell is the only place I have not tried only because there isnt one around us.
We don't have any Shell stations around here but I have run it in my truck before with no problems from it. I like Marathon gas, my truck runs very well on it. It does well on 7-11 gas too. I get a little bit more MPG from Marathon though.
Another thing I like about Marathon is they are an American company based in Findlay, Ohio and they only use crude oil from the USA, Mexico and Canada. 7-11 is the same, they have their own proprietary blend of gas and it is refined form USA and Canadian oil.
I have ran shell my truck doesn't like it at all a i have to runirving and i can't use anything but supreme (97 octane)or it will ping and spark knock lake crazy.
I usually go to Valero. Truck seems to run the same on pretty much everything. I like Valero and they're also an American company. (I believe, correct me if I'm wrong)