Smythe
Active member
Its the same stuff, the supermarkets don't have there own refineries, they just buy it off the "named" ones where you buy it from.
It is the same base product but supermarkets use their own additive in the fuel which is not to the standard of Texaco, Shell etc
Also supermarkets such as Tesco may not have their own refineries but they do have their own storage facilities mainly on the Thames in Essex and have been known to buy and import very cheap and poor quality fuel from Russia, and then spike it with an additive to try and raise the octane level.