oskar27 Posted December 30, 2012 Report Share Posted December 30, 2012 I was reading in the 2013 Edge operators manual that says " for recommended fuel to use Regular unleaded with a pump (R+M)/2 octane rating of 87" Just curious, what is (R+M)/2 ? Quote Link to comment Share on other sites More sharing options...
Gimp Posted December 30, 2012 Report Share Posted December 30, 2012 It's the formula used to come up with the octane rating in the U.S. and I believe Canada as well. Europe and Japan use another method of calculating the octane rating. For that reason, I understand the an gas that has an octane rating of 87 here, would have a higher number in Europe. I think that the reason they specify that is in case North American built Edge is exported to Europe the owner will be able to know that the correct octane rating number will be different due to the different scale. (Or at least Ford has covered itself for the warranty.) In this case an example I can think of would be members of the U.S. military who have their cars shipped to Germany or Italy for their tour of duty there. (I did that many years ago although I had no idea about this formula and apparently just correctly assumed that regular here was regular there.) Of course, few people other than petroleum engineers are going to understand what that means in the owners manual. Quote Link to comment Share on other sites More sharing options...
oskar27 Posted December 31, 2012 Author Report Share Posted December 31, 2012 Thanks Gimp for the info. Did not want to be too technical but I was just curious what the (R+M)/2 means. Your explanation is enough Quote Link to comment Share on other sites More sharing options...
EdgeGermany Posted December 31, 2012 Report Share Posted December 31, 2012 RON Reaserch Octane Number. (Used in Europe and elswhere in gas stations)MON Motor Octane Number.AKI Anti-Knock Index. This is the number that is posted on the gas station in the USA as "Octane". It is derived as (RON + MON)/2 Quote Link to comment Share on other sites More sharing options...
oskar27 Posted December 31, 2012 Author Report Share Posted December 31, 2012 That is very good info EdgeGermany, thanks BTW my son works in Europe, he has an Alfa Romeo GT V6 and belongs to an Alfa Romeo racing club but he said that he doesn't know about the Edge. Since you are in Germany and you have an Edge, did you buy it in Germany or you import it from US? Just wonder if the Edge is available in Europe Quote Link to comment Share on other sites More sharing options...
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