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I just recently bought a 2017 focus st. When I went to fill up I put 87 in it ( the manual said 87 is okay, but now I know 93 is overall better for the car). Will the octane of the gas effect boost. Because ever since I filled up with 87 I have very little boost in first, between 1/4 and 1/2 boost in second and 3-5 all reach above 1/2. Any responses would be appreciated.

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It does bring horsepower down to about 240 if I remember correctly. The ECU will compensate and lower power to prevent detonation
 
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