The ethanol content if its < E10 is pretty negligible -- it more like any odd hiccups (random miss) might be attributed to it in the absence of a better explanation, but really its fine.
The 94 octane (assuming AKI rather than RON) is worth it if you are tuned and running a little more ignition advance or the car sees hot laps on the track -- otherwise, I doubt you'll find much of a difference in power either.
On the other hand, it certainly won't hurt -- what's the price difference compared to 91 and can you get 93?
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