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Honestly, it’s only on page 15 where it is describing a sticker on the tank that it shows the lower octane. On page 80 it states 95 RON minimum, and describes fuel type in detail. And the service manual says the same. Anyone still have their sticker so we can see what it actually says?
Owners manual shows pg. 15 as you posted with 91 min., but page 79 on mine shows the contradiction of both 91 and 87.H
Honestly, it’s only on page 15 where it is describing a sticker on the tank that it shows the lower octane. On page 80 it states 95 RON minimum, and describes fuel type in detail. And the service manual says the same. Anyone still have their sticker so we can see what it actually says?
You said service manual shows the same. Where please, not doubting, just curious. My pdf service manual is same one my dealer uses cause we were looking up oil drain plugs once, and pg 591 shows the pic I posted last with 87 octane in the US. Some pg. earlier in the same pdf had 89 octane. Triumph really has bad proof readers!
My take is engine knock/pinging is your clue grade too low, and choosing lowest octane recommended by manufacturer without pinging is best for engine/performance.
( higher octane I read has slightly less co2 emitted, possibly a motive)