Different grades of fuel

[phil1987]

So apologies if this topic has already recently been covered. I'm regularly hearing from people about how the fuel at somewhere like ASDA for example is a lesser grade than that at BP for example - and that hence that contributes to the price difference.

Just wondering what the PH community knowledge/opinion is on this about any differences (if any) of the grade of fuel from different suppliers?

Cheers,

Phil.