Amongst E5s or supers as you said, the three hightest RON valued ones are Shell V Power, Tesco Momentum and Esso Synergy Supreme (ESSO’s E5). These three have RON 99.
ALL OTHER supers, or E5s, on any other UK forecourt (sainsbury’s, TEXACO, BP, Gulf etc) are RON97
(note TEXACO also do a RON 99, but very rare and not in many stations (https://texaco.co.uk/PublishingImages/Pages/Supreme99/Supreme%20Fuel%2099%20Performance+%20Stockist.pdf)
Also, amusingly, I emailed Texaco a while back (aug '23) and asked if they were going to extend their RON99 across more areas/stations. They emailed back saying ’ ‘we do not currently have any plans to release RON99 anywhere in the UK at the moment’… To which I emailed them their own website on RON99 and their own PDF of stations which sell it lol)
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