"Be aware that the USA, Canada
"Be aware that the USA, Canada and a few other countries use a different scale of Octane ratings to those used in European and many other countries.
the Uk and as far as i know all other European countries use the "Research Octane number" (RON)the USA use an average of what is known as the Motor Octane number (MON) and the RON. It is known as the Anti Knock Index AKI or Road Octane number (RdON)
Fuel that is classed as 87 Octane in the USA would be classed as 91-92 on the RON scale.
98 RON would be classed as 93-94 in the USA.
Just an aside because I'm sure folks in the UK and other countries that use the RON system must be puzzled by the recommendations from the USA to use 87 or 89 octane!"