Yes, the number on the pump is the average of the research and motor methods, but there are other numbers that average out to 87. Research doesn't HAVE to be 93 and motor doesn't HAVE to be 81 in order for R+M/2 to be 87.
Research 91 + Motor 83 = R+M/2 87.
Research 89 + Motor 85 = R+M/2 87.
IIRC, the research and motor methods are "generally" 10 points apart, but not always, and surely the testing technology is improving so the results are getting closer and closer to each other. Octane is money, and the more accurate the testing the more profitable it is for the oil companies.
Plus you also just know those oil companies are cheating the octane rating a little. What's saying the 87 you buy isn't 86 or even 85? "Whoops, guess our blending system is a little out of calibration."
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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