Costco Gas Lower Mileage

So, I was reading an article on Life Hacker on how brand name gas is rarely worth it, and I gotta say that I get noticeably lower mileage from Costco gas.
Anyone else think they get lower gas mileage when they fill up at Costco?

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I did notice a subtantial reduction in milage.
Me on 3/9/12
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I did notice a subtantial reduction in milage.
By Me on 3/9/12