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I found absolutely no diffferance what fuel I use. Whether its shell, shell v power or bp. Every now and then I fill up with the good stuff but even supermarket fuel comes from the same place. It's just the additives each brand put in.
You will find it's a bit more than just the additives.
Yes the fuel comes from the same refinery but the cheaper stuff doesn't get as well refined, . It's all about the hydocarbons in the fuel, the shorter the chains of hydrocarbons the better the fuel and the better it burns. So you get what you pay for. I do 30k a year and the difference is about 50 miles per tank with a noticable response and acceleration from the engine. Used to have a corsa and that wouldn't start first time with any supermarket fuel and was fine with the premium brands.