Expressed using a different formula. Same gas, same characteristics, different test method to calculate burning characteristics.
Exactly. In Europe they only test octane with the Motor Octane Number test. In the US, the pump label Anti Knock Index is actually an average of the MON and Research Octane Number. With a given fuel, the MON is always higher than the RON numbers. A given fuel might have a 95 MON (printed on the pump in Yurp) and an 87 RON. That works out to a 91 AKI which is what they'd print on the pump in the US, for the same damn fuel.
MON is a much more useful number for us, because it tests the fuel under conditions much closer to the real world. 900rpm vs. 600rpm, higher inlet temps, etc.
Different fuels of the same AKI number will have different octane sensitivity. That is the difference between the MON and RON numbers. That means that while one 91 AKI fuel might run fine in a high performance engine, another 91 won't, depending on conditions.
But, you knew all that, right Mookher?
Go on hotshot, try the EGR question. Bonus points if you can tell me why the OEM's stopped using EGR in the 90's, then brought it back again in the 00's.
Be a sport.
R_Lefebvre and Jupiter Rover.....read up on who is who before you question someones experience in a given area, or its you who looks like the tarded fool..
Stop avoiding the fucking question, nut up, and give an answer!