higher ron does not mean cleaner fuel, just more explosive, super unleaded fuels have alot of cleaning addatives in them that helps clean out chambers,
Tesco 99 is s**t ruined my cups sparks 2x in a row and after switching to shell v-power no more problems.
if you dont redline your car it doesnt really matter to much in my experience but it will run slightly smooother and your chambers will be cleaner with super unleaded compared to standard stuff
use bp or shell in you 172, 182 or 197 for best results.