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Does anyone where put Costco 93 octane in their F10 M5? I tried it once when I had my e39 M5 and noticed slight loss of performance so wanted to see if anyone uses it on their F10 and if so, if you have noticed any loss in performance or reduced gas mileage?
 

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I also use Costco exclusively in all my cars. F10 m5, e39 m5, Porsche 911 Turbo, Maserati Gran Turismo, Audi q7 v8, Shelby Mustang. All have never had an issue. In fact, it is Chevron 93. Same source.
 
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