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It won't make less hp unless it has to pull timing.
If you live in an area with only 91 its just something you have to accept if you want to own these kind of cars. I understand why people worry about it, but its really not that big of a deal when you think it through. And given that you cant do a thing about it, there isnt much of a point of worrying.
The only thing you can do is get a tune at some point when you mod the car that is optimized for the gas you always use.
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