Some say that brand XYZ fuel is better quality than others, and that they'd only ever go to that brand outlet for fuel.
Since there's only two petroleum fuel plants in this country, and we import large amounts from overseas, I'm thinking that fuel quality at the wholesale level is probably a little variable and evenly distributed between different brand outlets?
Fuel quality is probably more a function of individual stores... how well they maintain their tanks from water ingress & sediment etc.
What's the 'good oil' on this matter?