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In his comments people have asked him to compare Shell 91 vs Esso 91 vs Chevron 91 but he says he won't do it because the Chevron 91 is probably equally as crappy. Unfortunately this doesn't really help me since I used to interchangeably fill up with Shell/Chevron 91 because my car really doesn't warrant 94.
So this test doesn't really confirm that Chevron is better than Shell overall, it just confirms that for max performance vehicles the top tier Chevron is better than Shell. Shell 91 and Esso 91 dyno'd the same... Now if he did a comparison of 87 for all major brands, it would probably be more relevant to the common person.
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