I read somewhere that these fuels are slightly less explosive, therefore giving a longer burn in the cylinder, this is supposed to provide a little more power and be smoother through the stroke.
I fill up up with this about 1 in 10 times, mainly for its cleaning properties. I do feel a difference, but as you say it could be down just to the change of weight. Logically, I can't quite believe that I would be able to feel the difference a microsecond of extra fire would make.
I use supermarket fuel mostly and never had a problem (I think it's sourced from Esso).
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