gtski is correct in that the R+M/2 octane measurement is about 4 points lower than the research method. In other words 87 octane by the R+M/2 method is about 91 octane by the research method. The 89 octane that gtski runs is about 93 octane by the research measurement. I don't think there is a fixed standard, and different companies may use different values for their research or motor number. If you use 93 octane by the R+M/2 method the research number is 97, seems like overkill.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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