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It wasn't too long ago that Shell was advertising their new additive package. I'm sure it's good fuel, but it's probably not all that much different from other "top tier" brands.
Something to be aware of, higher octane fuel actually has (slightly) less energy per volume than lower octane fuels. On the one hand, some engines may add timing due to increased resistance to knock, but on the other, there's physically less energy released.
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