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It is my understanding that gas stations have two master gas tanks, even though they offer three grades. So the middle gas grade is actually a mix of the lower master and the higher master already.
Also Mobil is a Top Tier Gasoline station. Top Tier is a nonGovernment regulated fuel additive initiative, they claim there gas additives are better than generic gas. I haven't seen any independent testing, to say yea or nay on the subject; but that is why the top tier gas stations will typically be more expensive than normal.
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