I also use Shell 91 Premium, which also has a better additive package than their 87 Regular.87 isn't lower quality anymore, for a long time. Just has less octane. Which has nothing to do with quality.
It is NOT just about octane. It is about cleanliness. Sludge & Carbon are not going to be happy in my Maverick.
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10000 gives me the collywobbles... simple as!