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You pretty much answered your own question. It's the additives. Shell is excellent gasoline for our cars. I believe they have the highest amount of additives for the gasolines that qualify for Top Tier rating. Exxon also is Top Tier and excellent gasoline.
I buy Costco which is Top Tier but is on average 15 - 20 cents a gallon cheaper than the Shell stations near me. And since it is a Top Tier it is fine for my 1er. It does have less additives than Shell but still qualifies as Top Tier.
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