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The 87 octane will have a slight, noticeable power drop over 92-93 octane. A slight drop in fuel economy and some audible pinging with the windows down.

I've run all grades and currently mixing E85 with 87 octane.
 

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I found the octane matters little for mpg. The 2.0T does have more pep with higher octane.

I've been mixing E85 and 87 octane. I mix 30% E85 and 70% 87 octane for about 93-94 octane. Cold start is good so far at 25°F degrees but mileage does suffer with E85.
 
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