This is odd so I’m asking if anyone else has had this experience?
I seem to be noticing that if I fill up at my local supermarket, that the car does a good number of miles less than if I fill up at Esso or some other ‘brand’ garage.
I seem to have noticed this a number of occassions now.
Is this my imagination, my unique experience – or have others had similar experiences?
The Shiny Headed Prophet 
I think I am right in saying that the fuel we get from some places especially Supermarkets is generally of a lower grade which means less mileage. Or you could go contraversial and say they dont get their pumps checked often enough? Ah TESCO the rulers of the world.