It was mentioned recently in this group, the opinion that branded petrol (ie shell, BP, esso etc) was better than the supermarket brands. To the extent that it could be detected in the better running of certain engines.
I would have thought that there were all sorts of trading standards coming into play here. Surely petrol cannot just end up without some sort of eye being kept on the quality and the Octane etc.
Would be interested to hear if others found some petrol was noticeably better than others? Thanks.