Shell is a "top tier" gas station and Marathon is not. Google "top tier gas" and you'll see that there is a better quality of gas sold at Shell and other top tier stations, using detergents to keep your engine clean and not apt to foul with deposits.
That said, I hate giving my business to that Shell but for a few cents more as compared to Marathon I'll buy at Shell. Usually though I'll buy on 466 where the both Shell stations there seem to not play that game of cash or charge pricing. Bottom line is my usual purchase in the cart is about 3 gals, not a big deal if I pay 6 cents more per gal. but know I'm getting a top tier gas.
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Les
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