There are 2 gas stations across the street from each other about 2 miles from my house. One charges $3.439 for a gallon of Shell and the other charges $3.499 for a gallon of Texaco. Where would you, Sheila and Noomi, buy your gasoline? I know where I stop.
There is barely a difference, and I would go to the servo in which I get the better service.
FYI, I only go to a local chain for my petrol. They can charge up to three to four cents more per litre, but I don't mind. Why? Because they know me and I have always gotten good service - and sometimes, service is more important than saving a few dollars.