Posted by don656 on October 19, 2011 at 07:06:22 from (75.179.143.177):
A couple of weeks ago, I got some recommendations on this site that I should use a minimum of 93 octane gas in my 656 farmall. I had been using mid grade (89 octane rating). My operator's manual says to use fuel with a minimum of 93 octane, research method.
I looked up some information on octane ratings and it said that the research method was approximately 8 to 10 points higher than the motor method. The ratings at the pump are an average of the R & M numbers.
So, if I assume that the R method is only 8 points higher than the M method, then to get an average value of 89 octane, the M number would be 85 and the R number would be 93.
Therefore, isn't the 89 average octane sufficient to use in my tractor? (since it means that the R number is at least 93)
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