Interesting...

Since I'm interested in buying a Stemme S10-VT I checked the flight
manual and it requires either 100LL avgas or 96 octane mogas. I don't
recall it stating the whether it was RON only or the average as used in
the USA. Can anyone comment on that?

On 1/1/2016 12:32 PM, Bruce Hoult wrote:
On Sunday, December 27, 2015 at 9:07:34 PM UTC+3, Andrzej Kobus wrote:
You also need to consider the fuel available in US. The octane rating is generally lower than in EU, the highest is 93.
That's because they're not using the same units!!

Most of the world -- certainly Europe (including here in Russia) and New Zealand/Aus use RON (Research Octane Number). "Standard" fuel is usually 91. traditional "super" 95 or 96, and newer super 98.

The US and Canada use (RON+MON)/2, which is generally 4 - 6 points lower for the exact same fuel.

--
Dan, 5J