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I have done several 'tests' while taking my trips to Texas from CA.
My car is one of those that says '91'.
It does make a difference in mpg if I drop down. according to the scangauge, the ign advance drops down.
Whoever in othere threads (ignoring the ethonl) going up to 91 from a car that is supposed to run 87 didnt help.
But I think mort might be onto something in his post.
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