I have to agree the premium fuel seems to make my van run better, I usually put BP but I lent it to a mate and he filled it up as a thank you. I seemed flat and was under performing. I asked him what he had put in it and he just said '' what ever they sell in Sainsbury's''. 400 miles later I put the BP back in and it was back to normal.
The supermarkets but what ever they can get hold of. There was a problem a few years ago that one of them I think it was Tesco's was bunging up filters or causing problems in some way.
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