Remember a few years ago, Tesco had silicon in their fuel? This came out of the Terminal at Purfleet. The terminal is Vopak and they still operate..
I have noticed zero difference between Shell "V" power & Sainsburys 97 Ron.
It is alleged that "JET" fuel is all 97 RON.
Chaps ALL fuel is fed to ALL distrubition terminal across the UK by all the refineries in the UK, all companies load their tankers from the same places, wether is sainsburys or shell or esso.
Additives are the name of the game here. and this amount of additive determins the pump price.
Drive slower= better MPG?