mexican
Living Legend
I have used as low as 86 on mine, never had a problem!I certainly understand the argument for Triumph whiffing on stating in bold print the exact octane number to use. On my 2005 and 2014 I used 91 even though 87 was the number Triumph recommended for both Rockets. Both ran fantastic on 91. I use 91 on my 2020 and it also runs like a scalded assed ape and I shall continue to use 91. There was zero long term affect on my 05 or 14 Rockets using 91 and I doubt there will be for my 2020 so, 91 it is. Some may say it's wasted money but I say it's my money and I've wasted it in worse ways than on higher octane gas. Don't ask!