I’m wondering
What is the difference between the EU and US EVO IX version?
I don’t mean the outside, but the engine.
I red here, that you are doing 280 on 91 octane gas.
EU spec has 280 on 98 octane gas (recommended)

Well why I can’t use normal 95 gas in EU version?
Please explain
Thank you

 

Are you sure EU spec requires 98 Octane or 98 RON?

 

OK
I was allwas told, that it is 98octane
and 98RON is?

 

i'm sure you mean 98RON.
We have 98RON as well, not sure what the MON is though

 

http://en.wikipedia.org/wiki/Octane_rating

 

Well
Than your 91 is EU 95RON
So can I ride (daily, no track or race) on 95?

 

we get the EU / Austrailian spec Evos here in South Africa, they are running on 95RON (~roughly 91 R+M/2) without hassles, but we live at 5600Ft above sea level, but if you want the most out of the car I would recommend 98+ RON, especially if you live at sea level.

RON = Research Octane Number
MON = Motor Octane Number

In the USA guys use an average = R+M/2 to calculate the octane, tus if they are talking 91 (~96RON) or 93 (~98RON)

Generally the MON number is ~10 points below the RON number:

Mike

 

Engine should be no different, you guys probably get sayc in the back and some bumper/interior modifications. I know in US we have to have a steel bar behind the steering wheel (console) and I'm not sure if that's necessary in EU etc. etc.
Also, I don't know the differences between OBD-2E and US OBD-2 so ECU might be slightly different.
All in all, both cars are pretty much the same and it probably tells you in your user manual that you could run on 95 in case 98+ is not available.