There was a magazine article many years ago in England where they tested fuels from different stations.
The supermarkets gave the lowest mpgs, however there is the money saving.
Many years ago now I choose a particular brand of station and used only that station for 4-6 weeks, then I changed to a different station and did the same.
In the end I found that the branded stations overall were better for me, I haven't lived in England for 6 years now, but I think that it was BP that gave me the best, (I can picture the station, just can't remember the name). Although the supermarkets were cheaper the lower mpg meant that it cost me more.
I did read that not all fuels are equal, and that the super markets buy the lower quality fuels, plus the premium stations often have extra additives in with the fuels.
Mike
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