Yes, it is strongly advised that you should be using higher quality fuels once having your engine optimised, it’s not an old wife’s tale the better-quality fuel helps with the ignition cycle and the combustion process, poor quality fuels with lower RON rating will induce Knock/ pre-detonation this is bad but can sometimes be cured with using the right fuel and good servicing walnut blasting is a worse case fix. In easy terms it’s like a human trying to run a marathon drinking river water for a while you will be ok but as the time goes by you will start to get sick, well engines work the same, put in good fuel and you will get great results.