'good morning' has stated ...
"The fact of the matter is that fuel from a garage forecourt has no quality assurance that it is what it says on the pumps."
I'm very sorry to say this statement is not accurate.
Unleaded petrol at the forecourt IS a quality assured fuel meeting the requirements of BS 7070, that is a government administered standard and every last litre of fuel will meet this standard, whether it comes from a Tesco, Morrison's, Shell, BP, ESSO, Sainsburys ... or who ever ...
At all these locations there is clear signage that the fuel supplied meets BS 7070, it is therefore complete nonsense to say that this fuel is NOT quality assured.