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I'll try and dig up an old article I found. Tested on an z3m coupe, Honda ctr. Stuck a borescope in the engines. Were noticeably cleaner (the valves and piston's iirc) with the super brands.
The 200 idles and runs better on vpower, noticeable flat spots on 95. Even if there was no difference in how it runs, I'd still use it for the cleaning properties.