Just a bit OT, but Optimax is/was consistently 98.4 RON. Sometimes as high as 99.3RON, so it is safe to say the new fuel is just optimax rebadged...
Shell have no doubt done this due to everyone else bringing out 99RON fuels.
Shell have always been guarded on the true octane rating of Optimax, so if they suddenly started claimning it was about 99, they'd have a mutiny!
A quick rebrand is the safest bet...
All IMO, etc
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