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I've also had bad luck with Kroger and (certain) Sheetz gas. Not 15 mpg, but maybe 10% on worse case scenarios. What sucks is its' hard to determine gas as a culprit because it's nearly impossible (very difficult) to do A-B-A-B tests with it.
I try to stick with Shell/BP/Sunoco/Chevron for that reason, even if it's not working, all the gas in my town is within 1 cent of each other anyway, so there is no point in driving up to the grocery store to get watered down gas anywho. (:
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