Hi AZRider,
You have spotted another of Triumph's anomolies in one of their Trophy Publications !
The UK / European versions of the Owners Handbook
make NO reference to R+M/2, because this is a US Specification.
From Wikipedia :
In most countries in Europe (also in Australia, Pakistan and New Zealand) the "headline"
octane rating shown on the pump is the RON, but in Canada, the United States, Brazil,
and some other countries, the headline number is the simple mean or average
of the RON and the MON, called the Anti-Knock Index (AKI), and often written on pumps as (R+M)/2.
What I think Triumph
should have done is to include the same Rating version on both pages,
instead of mixing the two, and putting the Euro Rating on Page 169, or at least incude an
explanatory note, although it is technically correct, as it could easily lead to confusion !

Here's a chart showing that 87 R+M/2 is the same as EURO 91 RON :

As you can see 91 R+M/2 is equivalent to Euro 95 RON,
which is not a Premium grade of fuel in the UK / Europe,
but is the normally available standard Unleaded fuel,
and which the Trophy runs well on.
If you were to "mistakenly" put 91 R+M/2 Grade fuel in the tank,
it would be the equivalent of the 95 RON that we generally use here in the UK.
This could explain previous Topics where US Trophy owners have said they use "Premium"
Fuel in their Trohy with good results, and may have been using 91 R+M/2 in the mistake belief
that it is a Premium Grade of fuel.
I'm amazed no-one has spotted this before, and I would be grateful if you could provide the exact
wording on your Page 69, together with the Publication Number from the "Foreward" on Page 4,
so that I can add the details to this Topic :
Owners, Audio, and Service Handbooks + Service Manual errataCheers
