You cant really buy poor quality fuel in the UK.. I avoid supermarkets all the same though, my car runs smoother on BP, ESSO but i still wouldnt call supermarkets fuels poor quality at 95 RON. And cheap rubber is good for some ppl. when i used to have a battered old rover 200 at nearly 200k that was worth probably £300 of course ill buy budgets
Understand your tyre choice but I was talking about a Lexus. Saw a Lexus 4x4 the other day with kids in the back and really cheap tyres on, I guess each to their own but I would always buy the best I could afford especially if I had kids in the back.
On fuel I notice a real difference between 95ron supermarket fuel and Shell V power and as someone who enjoys driving its a price worth paying. Maybe the fuel filler issue is more about the fuel hose than the car though, I know people who gave all had problems at sainsburys but never at Shell.