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I had this same question recently.
It is fine to use.
You have 2 choices. Sunoco 91 or Ultra 94
Sunoco 91 has no ethanol, so it is a true 91 octane
Ultra 94 has ethanol which bumps up the rating a few points.
Our cars are mapped to use fuel that has ethanol so there are no concerns using it.
I started with Sunoco 91, but went to back Ultra 94 and have not had any issues or felt the car performs less.
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